diff --git a/Cargo.lock b/Cargo.lock
index c26c129..5a8e505 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,188 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "actix-codec"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f7b0a21988c1bf877cf4759ef5ddaac04c1c9fe808c9142ecb78ba97d97a28a"
+dependencies = [
+ "bitflags 2.6.0",
+ "bytes",
+ "futures-core",
+ "futures-sink",
+ "memchr",
+ "pin-project-lite",
+ "tokio",
+ "tokio-util",
+ "tracing",
+]
+
+[[package]]
+name = "actix-http"
+version = "3.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3ae682f693a9cd7b058f2b0b5d9a6d7728a8555779bedbbc35dd88528611d020"
+dependencies = [
+ "actix-codec",
+ "actix-rt",
+ "actix-service",
+ "actix-utils",
+ "ahash",
+ "base64",
+ "bitflags 2.6.0",
+ "brotli",
+ "bytes",
+ "bytestring",
+ "derive_more",
+ "encoding_rs",
+ "flate2",
+ "futures-core",
+ "h2",
+ "http",
+ "httparse",
+ "httpdate",
+ "itoa",
+ "language-tags",
+ "local-channel",
+ "mime",
+ "percent-encoding",
+ "pin-project-lite",
+ "rand",
+ "sha1",
+ "smallvec",
+ "tokio",
+ "tokio-util",
+ "tracing",
+ "zstd",
+]
+
+[[package]]
+name = "actix-macros"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e01ed3140b2f8d422c68afa1ed2e85d996ea619c988ac834d255db32138655cb"
+dependencies = [
+ "quote",
+ "syn",
+]
+
+[[package]]
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+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "13d324164c51f63867b57e73ba5936ea151b8a41a1d23d1031eeb9f70d0236f8"
+dependencies = [
+ "bytestring",
+ "cfg-if",
+ "http",
+ "regex",
+ "regex-lite",
+ "serde",
+ "tracing",
+]
+
+[[package]]
+name = "actix-rt"
+version = "2.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24eda4e2a6e042aa4e55ac438a2ae052d3b5da0ecf83d7411e1a368946925208"
+dependencies = [
+ "futures-core",
+ "tokio",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b02303ce8d4e8be5b855af6cf3c3a08f3eff26880faad82bab679c22d3650cb5"
+dependencies = [
+ "actix-rt",
+ "actix-service",
+ "actix-utils",
+ "futures-core",
+ "futures-util",
+ "mio",
+ "socket2",
+ "tokio",
+ "tracing",
+]
+
+[[package]]
+name = "actix-service"
+version = "2.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b894941f818cfdc7ccc4b9e60fa7e53b5042a2e8567270f9147d5591893373a"
+dependencies = [
+ "futures-core",
+ "paste",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "actix-utils"
+version = "3.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88a1dcdff1466e3c2488e1cb5c36a71822750ad43839937f85d2f4d9f8b705d8"
+dependencies = [
+ "local-waker",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "actix-web"
+version = "4.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1988c02af8d2b718c05bc4aeb6a66395b7cdf32858c2c71131e5637a8c05a9ff"
+dependencies = [
+ "actix-codec",
+ "actix-http",
+ "actix-macros",
+ "actix-router",
+ "actix-rt",
+ "actix-server",
+ "actix-service",
+ "actix-utils",
+ "actix-web-codegen",
+ "ahash",
+ "bytes",
+ "bytestring",
+ "cfg-if",
+ "cookie",
+ "derive_more",
+ "encoding_rs",
+ "futures-core",
+ "futures-util",
+ "itoa",
+ "language-tags",
+ "log",
+ "mime",
+ "once_cell",
+ "pin-project-lite",
+ "regex",
+ "regex-lite",
+ "serde",
+ "serde_json",
+ "serde_urlencoded",
+ "smallvec",
+ "socket2",
+ "time",
+ "url",
+]
+
+[[package]]
+name = "actix-web-codegen"
+version = "4.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f591380e2e68490b5dfaf1dd1aa0ebe78d84ba7067078512b4ea6e4492d622b8"
+dependencies = [
+ "actix-router",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "addr2line"
 version = "0.22.0"
@@ -17,12 +199,49 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "ahash"
+version = "0.8.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e89da841a80418a9b391ebaea17f5c112ffaaa96f621d2c285b5174da76b9011"
+dependencies = [
+ "cfg-if",
+ "getrandom",
+ "once_cell",
+ "version_check",
+ "zerocopy",
+]
+
+[[package]]
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+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "aligned-vec"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4aa90d7ce82d4be67b64039a3d588d38dbcc6736577de4a847025ce5b0c468d1"
 
+[[package]]
+name = "alloc-no-stdlib"
+version = "2.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc7bb162ec39d46ab1ca8c77bf72e890535becd1751bb45f64c597edb4c8c6b3"
+
+[[package]]
+name = "alloc-stdlib"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94fb8275041c72129eb51b7d0322c29b8387a0386127718b096429201a5d6ece"
+dependencies = [
+ "alloc-no-stdlib",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.86"
@@ -96,6 +315,12 @@ dependencies = [
  "rustc-demangle",
 ]
 
+[[package]]
+name = "base64"
+version = "0.22.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
+
 [[package]]
 name = "bincode"
 version = "1.3.3"
@@ -125,9 +350,39 @@ checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
 
 [[package]]
 name = "bitstream-io"
-version = "2.4.2"
+version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "415f8399438eb5e4b2f73ed3152a3448b98149dda642a957ee704e1daa5cf1d8"
+checksum = "7c12d1856e42f0d817a835fe55853957c85c8c8a470114029143d3f12671446e"
+
+[[package]]
+name = "block-buffer"
+version = "0.10.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
+dependencies = [
+ "generic-array",
+]
+
+[[package]]
+name = "brotli"
+version = "6.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74f7971dbd9326d58187408ab83117d8ac1bb9c17b085fdacd1cf2f598719b6b"
+dependencies = [
+ "alloc-no-stdlib",
+ "alloc-stdlib",
+ "brotli-decompressor",
+]
+
+[[package]]
+name = "brotli-decompressor"
+version = "4.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a45bd2e4095a8b518033b128020dd4a55aab1c0a381ba4404a472630f4bc362"
+dependencies = [
+ "alloc-no-stdlib",
+ "alloc-stdlib",
+]
 
 [[package]]
 name = "built"
@@ -149,9 +404,9 @@ checksum = "5ce89b21cab1437276d2650d57e971f9d548a2d9037cc231abdc0562b97498ce"
 
 [[package]]
 name = "bytemuck"
-version = "1.16.1"
+version = "1.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b236fc92302c97ed75b38da1f4917b5cdda4984745740f153a5d3059e48d725e"
+checksum = "78834c15cb5d5efe3452d58b1e8ba890dd62d21907f867f383358198e56ebca5"
 
 [[package]]
 name = "byteorder"
@@ -171,11 +426,20 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "514de17de45fdb8dc022b1a7975556c53c86f9f0aa5f534b98977b171857c2c9"
 
+[[package]]
+name = "bytestring"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74d80203ea6b29df88012294f62733de21cfeab47f17b41af3a38bc30a03ee72"
+dependencies = [
+ "bytes",
+]
+
 [[package]]
 name = "cc"
-version = "1.0.104"
+version = "1.0.98"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74b6a57f98764a267ff415d50a25e6e166f3831a5071af4995296ea97d210490"
+checksum = "41c270e7540d725e65ac7f1b212ac8ce349719624d7bcff99f8e2e488e8cf03f"
 dependencies = [
  "jobserver",
  "libc",
@@ -249,6 +513,32 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3d7b894f5411737b7867f4827955924d7c254fc9f4d91a6aad6b097804b1018b"
 
+[[package]]
+name = "convert_case"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6245d59a3e82a7fc217c5828a6692dbc6dfb63a0c8c90495621f7b9d79704a0e"
+
+[[package]]
+name = "cookie"
+version = "0.16.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e859cd57d0710d9e06c381b550c06e76992472a8c6d527aecd2fc673dcc231fb"
+dependencies = [
+ "percent-encoding",
+ "time",
+ "version_check",
+]
+
+[[package]]
+name = "cpufeatures"
+version = "0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53fe5e26ff1b7aef8bca9c6080520cfb8d9333c7568e1829cef191a9723e5504"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "crc32fast"
 version = "1.4.2"
@@ -289,6 +579,16 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a81dae078cea95a014a339291cec439d2f232ebe854a9d672b796c6afafa9b7"
 
+[[package]]
+name = "crypto-common"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3"
+dependencies = [
+ "generic-array",
+ "typenum",
+]
+
 [[package]]
 name = "csv"
 version = "1.3.0"
@@ -329,17 +629,49 @@ dependencies = [
  "powerfmt",
 ]
 
+[[package]]
+name = "derive_more"
+version = "0.99.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f33878137e4dafd7fa914ad4e259e18a4e8e532b9617a2d0150262bf53abfce"
+dependencies = [
+ "convert_case",
+ "proc-macro2",
+ "quote",
+ "rustc_version",
+ "syn",
+]
+
 [[package]]
 name = "deunicode"
 version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "339544cc9e2c4dc3fc7149fd630c5f22263a4fdf18a98afd0075784968b5cf00"
 
+[[package]]
+name = "digest"
+version = "0.10.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
+dependencies = [
+ "block-buffer",
+ "crypto-common",
+]
+
 [[package]]
 name = "either"
-version = "1.13.0"
+version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "60b1af1c220855b6ceac025d3f6ecdd2b7c4894bfe9cd9bda4fbb4bc7c0d4cf0"
+checksum = "3dca9240753cf90908d7e4aac30f630662b02aebaa1b58a3cadabdb23385b58b"
+
+[[package]]
+name = "encoding_rs"
+version = "0.8.34"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b45de904aa0b010bce2ab45264d0631681847fa7b6f2eaa7dab7619943bc4f59"
+dependencies = [
+ "cfg-if",
+]
 
 [[package]]
 name = "equivalent"
@@ -407,6 +739,114 @@ version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
+[[package]]
+name = "form_urlencoded"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e13624c2627564efccf4934284bdd98cbaa14e79b0b5a141218e507b3a823456"
+dependencies = [
+ "percent-encoding",
+]
+
+[[package]]
+name = "futures"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "645c6916888f6cb6350d2550b80fb63e734897a8498abe35cfb732b6487804b0"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-executor",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
+]
+
+[[package]]
+name = "futures-channel"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eac8f7d7865dcb88bd4373ab671c8cf4508703796caa2b1985a9ca867b3fcb78"
+dependencies = [
+ "futures-core",
+ "futures-sink",
+]
+
+[[package]]
+name = "futures-core"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dfc6580bb841c5a68e9ef15c77ccc837b40a7504914d52e47b8b0e9bbda25a1d"
+
+[[package]]
+name = "futures-executor"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a576fc72ae164fca6b9db127eaa9a9dda0d61316034f33a0a0d4eda41f02b01d"
+dependencies = [
+ "futures-core",
+ "futures-task",
+ "futures-util",
+]
+
+[[package]]
+name = "futures-io"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a44623e20b9681a318efdd71c299b6b222ed6f231972bfe2f224ebad6311f0c1"
+
+[[package]]
+name = "futures-macro"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "87750cf4b7a4c0625b1529e4c543c2182106e4dedc60a2a6455e00d212c489ac"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "futures-sink"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fb8e00e87438d937621c1c6269e53f536c14d3fbd6a042bb24879e57d474fb5"
+
+[[package]]
+name = "futures-task"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38d84fa142264698cdce1a9f9172cf383a0c82de1bddcf3092901442c4097004"
+
+[[package]]
+name = "futures-util"
+version = "0.3.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d6401deb83407ab3da39eba7e33987a73c3df0c82b4bb5813ee871c19c41d48"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-macro",
+ "futures-sink",
+ "futures-task",
+ "memchr",
+ "pin-project-lite",
+ "pin-utils",
+ "slab",
+]
+
+[[package]]
+name = "generic-array"
+version = "0.14.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "85649ca51fd72272d7821adaf274ad91c288277713d9c18820d8499a7ff69e9a"
+dependencies = [
+ "typenum",
+ "version_check",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.2.15"
@@ -434,6 +874,25 @@ version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "40ecd4077b5ae9fd2e9e169b102c6c330d0605168eb0e8bf79952b256dbefffd"
 
+[[package]]
+name = "h2"
+version = "0.3.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81fe527a889e1532da5c525686d96d4c2e74cdd345badf8dfef9f6b39dd5f5e8"
+dependencies = [
+ "bytes",
+ "fnv",
+ "futures-core",
+ "futures-sink",
+ "futures-util",
+ "http",
+ "indexmap",
+ "slab",
+ "tokio",
+ "tokio-util",
+ "tracing",
+]
+
 [[package]]
 name = "half"
 version = "2.4.1"
@@ -462,6 +921,39 @@ version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d231dfb89cfffdbc30e7fc41579ed6066ad03abda9e567ccafae602b97ec5024"
 
+[[package]]
+name = "http"
+version = "0.2.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "601cbb57e577e2f5ef5be8e7b83f0f63994f25aa94d673e54a92d5c516d101f1"
+dependencies = [
+ "bytes",
+ "fnv",
+ "itoa",
+]
+
+[[package]]
+name = "httparse"
+version = "1.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fcc0b4a115bf80b728eb8ea024ad5bd707b615bfed49e0665b6e0f86fd082d9"
+
+[[package]]
+name = "httpdate"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df3b46402a9d5adb4c86a0cf463f42e19994e3ee891101b1841f30a545cb49a9"
+
+[[package]]
+name = "idna"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "634d9b1461af396cad843f47fdba5597a4f9e6ddd4bfb6ff5d85028c25cb12f6"
+dependencies = [
+ "unicode-bidi",
+ "unicode-normalization",
+]
+
 [[package]]
 name = "image"
 version = "0.25.1"
@@ -558,6 +1050,12 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f5d4a7da358eff58addd2877a45865158f0d78c911d43a5784ceb7bbf52833b0"
 
+[[package]]
+name = "language-tags"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d4345964bb142484797b161f473a503a434de77149dd8c7427788c6e13379388"
+
 [[package]]
 name = "lazy_static"
 version = "1.5.0"
@@ -645,8 +1143,10 @@ version = "0.1.0"
 name = "lesson18"
 version = "0.1.0"
 dependencies = [
+ "actix-web",
  "ciborium",
  "eyre",
+ "futures",
  "image",
  "lazy_static",
  "parking_lot",
@@ -654,6 +1154,7 @@ dependencies = [
  "serde",
  "thiserror",
  "time",
+ "tokio",
 ]
 
 [[package]]
@@ -673,6 +1174,23 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "local-channel"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b6cbc85e69b8df4b8bb8b89ec634e7189099cea8927a276b7384ce5488e53ec8"
+dependencies = [
+ "futures-core",
+ "futures-sink",
+ "local-waker",
+]
+
+[[package]]
+name = "local-waker"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d873d7c67ce09b42110d801813efbc9364414e356be9935700d368351657487"
+
 [[package]]
 name = "lock_api"
 version = "0.4.12"
@@ -685,9 +1203,9 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.22"
+version = "0.4.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
+checksum = "90ed8c1e510134f979dbc4f070f87d4313098b704861a105fe34231c70a3901c"
 
 [[package]]
 name = "loop9"
@@ -710,9 +1228,15 @@ dependencies = [
 
 [[package]]
 name = "memchr"
-version = "2.7.4"
+version = "2.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
+checksum = "6c8640c5d730cb13ebd907d8d04b52f55ac9a2eec55b440c8892f40d56c76c1d"
+
+[[package]]
+name = "mime"
+version = "0.3.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6877bb514081ee2a7ff5ef9de3281f14a4dd4bceac4c09388074a6b5df8a139a"
 
 [[package]]
 name = "minimal-lexical"
@@ -722,9 +1246,9 @@ checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
 
 [[package]]
 name = "miniz_oxide"
-version = "0.7.4"
+version = "0.7.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b8a240ddb74feaf34a79a7add65a741f3167852fba007066dcac1ca548d89c08"
+checksum = "87dfd01fe195c66b572b37921ad8803d010623c0aca821bea2302239d155cdae"
 dependencies = [
  "adler",
  "simd-adler32",
@@ -737,6 +1261,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a4a650543ca06a924e8b371db273b2756685faae30f8487da1b56505a8f78b0c"
 dependencies = [
  "libc",
+ "log",
  "wasi",
  "windows-sys 0.48.0",
 ]
@@ -765,9 +1290,9 @@ checksum = "0676bb32a98c1a483ce53e500a81ad9c3d5b3f7c920c28c24e9cb0980d0b5bc8"
 
 [[package]]
 name = "num-bigint"
-version = "0.4.6"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5e44f723f1133c9deac646763579fdb3ac745e418f2a7af9cd0c431da1f20b9"
+checksum = "c165a9ab64cf766f73521c0dd2cfdff64f488b8f0b3e621face3462d3db536d7"
 dependencies = [
  "num-integer",
  "num-traits",
@@ -831,9 +1356,9 @@ dependencies = [
 
 [[package]]
 name = "object"
-version = "0.36.1"
+version = "0.36.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "081b846d1d56ddfc18fdf1a922e4f6e07a11768ea1b92dec44e42b72712ccfce"
+checksum = "576dfe1fc8f9df304abb159d767a29d0476f7750fbf8aa7ad07816004a207434"
 dependencies = [
  "memchr",
 ]
@@ -884,12 +1409,24 @@ version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"
 
+[[package]]
+name = "percent-encoding"
+version = "2.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3148f5046208a5d56bcfc03053e3ca6334e51da8dfb19b6cdc8b306fae3283e"
+
 [[package]]
 name = "pin-project-lite"
 version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bda66fc9667c18cb2758a2ac84d1167245054bcf85d5d1aaa6923f45801bdd02"
 
+[[package]]
+name = "pin-utils"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
+
 [[package]]
 name = "pkg-config"
 version = "0.3.30"
@@ -923,9 +1460,9 @@ checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.86"
+version = "1.0.85"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
+checksum = "22244ce15aa966053a896d1accb3a6e68469b97c7f33f284b99f0d576879fc23"
 dependencies = [
  "unicode-ident",
 ]
@@ -1061,9 +1598,9 @@ dependencies = [
 
 [[package]]
 name = "ravif"
-version = "0.11.7"
+version = "0.11.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "67376f469e7e7840d0040bbf4b9b3334005bb167f814621326e4c7ab8cd6e944"
+checksum = "bc13288f5ab39e6d7c9d501759712e6969fcc9734220846fc9ed26cae2cc4234"
 dependencies = [
  "avif-serialize",
  "imgref",
@@ -1103,11 +1640,46 @@ dependencies = [
  "bitflags 2.6.0",
 ]
 
+[[package]]
+name = "regex"
+version = "1.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b91213439dad192326a0d7c6ee3955910425f441d7038e0d6933b0aec5c4517f"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38caf58cc5ef2fed281f89292ef23f6365465ed9a41b7a7754eb4e26496c92df"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-lite"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53a49587ad06b26609c52e423de037e7f57f20d53535d66e08c695f347df952a"
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a66a03ae7c801facd77a29370b4faec201768915ac14a721ba36f20bc9c209b"
+
 [[package]]
 name = "rgb"
-version = "0.8.40"
+version = "0.8.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a7439be6844e40133eda024efd85bf07f59d0dd2f59b10c00dd6cfb92cc5c741"
+checksum = "05aaa8004b64fd573fc9d002f4e632d51ad4f026c2b5ba95fcb6c2f32c2c47d8"
 dependencies = [
  "bytemuck",
 ]
@@ -1118,6 +1690,15 @@ version = "0.1.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "719b953e2095829ee67db738b3bfa9fa368c94900df327b3f07fe6e794d2fe1f"
 
+[[package]]
+name = "rustc_version"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+dependencies = [
+ "semver",
+]
+
 [[package]]
 name = "ryu"
 version = "1.0.18"
@@ -1130,6 +1711,12 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
+[[package]]
+name = "semver"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "61697e0a1c7e512e84a621326239844a24d8207b4669b41bc18b32ea5cbf988b"
+
 [[package]]
 name = "serde"
 version = "1.0.203"
@@ -1152,9 +1739,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.120"
+version = "1.0.117"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e0d21c9a8cae1235ad58a00c11cb40d4b1e5c784f1ef2c537876ed6ffd8b7c5"
+checksum = "455182ea6142b14f93f4bc5320a2b31c1f266b66a4a5c858b013302a5d8cbfc3"
 dependencies = [
  "itoa",
  "ryu",
@@ -1170,6 +1757,18 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_urlencoded"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3491c14715ca2294c4d6a88f15e84739788c1d030eed8c110436aafdaa2f3fd"
+dependencies = [
+ "form_urlencoded",
+ "itoa",
+ "ryu",
+ "serde",
+]
+
 [[package]]
 name = "server"
 version = "0.1.0"
@@ -1188,6 +1787,17 @@ dependencies = [
  "time",
 ]
 
+[[package]]
+name = "sha1"
+version = "0.10.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3bf829a2d51ab4a5ddf1352d8470c140cadc8301b2ae1789db023f01cedd6ba"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
 [[package]]
 name = "shared"
 version = "0.1.0"
@@ -1230,6 +1840,15 @@ dependencies = [
  "quote",
 ]
 
+[[package]]
+name = "slab"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f92a496fb766b417c996b9c5e57daf2f7ad3b0bebe1ccfca4856390e3d3bb67"
+dependencies = [
+ "autocfg",
+]
+
 [[package]]
 name = "slug"
 version = "0.1.5"
@@ -1267,9 +1886,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.68"
+version = "2.0.66"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "901fa70d88b9d6c98022e23b4136f9f3e54e4662c3bc1bd1d84a42a9a0f0c1e9"
+checksum = "c42f3f41a2de00b01c0aaad383c5a45241efc8b2d1eda5661812fda5f3cdcff5"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1343,10 +1962,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5dfd88e563464686c916c7e46e623e520ddc6d79fa6641390f2e3fa86e83e885"
 dependencies = [
  "deranged",
+ "itoa",
  "num-conv",
  "powerfmt",
  "serde",
  "time-core",
+ "time-macros",
 ]
 
 [[package]]
@@ -1355,6 +1976,31 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ef927ca75afb808a4d64dd374f00a2adf8d0fcff8e7b184af886c3c87ec4a3f3"
 
+[[package]]
+name = "time-macros"
+version = "0.2.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f252a68540fde3a3877aeea552b832b40ab9a69e318efd078774a01ddee1ccf"
+dependencies = [
+ "num-conv",
+ "time-core",
+]
+
+[[package]]
+name = "tinyvec"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c55115c6fbe2d2bef26eb09ad74bde02d8255476fc0c7b515ef09fbb35742d82"
+dependencies = [
+ "tinyvec_macros",
+]
+
+[[package]]
+name = "tinyvec_macros"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
+
 [[package]]
 name = "tokio"
 version = "1.38.0"
@@ -1385,6 +2031,19 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "tokio-util"
+version = "0.7.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9cf6b47b3771c49ac75ad09a6162f53ad4b8088b76ac60e8ec1455b31a189fe1"
+dependencies = [
+ "bytes",
+ "futures-core",
+ "futures-sink",
+ "pin-project-lite",
+ "tokio",
+]
+
 [[package]]
 name = "toml"
 version = "0.8.14"
@@ -1419,18 +2078,70 @@ dependencies = [
  "winnow",
 ]
 
+[[package]]
+name = "tracing"
+version = "0.1.40"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c3523ab5a71916ccf420eebdf5521fcef02141234bbc0b8a49f2fdc4544364ef"
+dependencies = [
+ "log",
+ "pin-project-lite",
+ "tracing-core",
+]
+
+[[package]]
+name = "tracing-core"
+version = "0.1.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c06d3da6113f116aaee68e4d601191614c9053067f9ab7f6edbcb161237daa54"
+dependencies = [
+ "once_cell",
+]
+
+[[package]]
+name = "typenum"
+version = "1.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
+
+[[package]]
+name = "unicode-bidi"
+version = "0.3.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08f95100a766bf4f8f28f90d77e0a5461bbdb219042e7679bebe79004fed8d75"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
+[[package]]
+name = "unicode-normalization"
+version = "0.1.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a56d1686db2308d901306f92a263857ef59ea39678a5458e7cb17f01415101f5"
+dependencies = [
+ "tinyvec",
+]
+
 [[package]]
 name = "unicode-width"
 version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0336d538f7abc86d282a4189614dfaa90810dfc2c6f6427eaf88e16311dd225d"
 
+[[package]]
+name = "url"
+version = "2.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22784dbdf76fdde8af1aeda5622b546b422b6fc585325248a2bf9f5e41e94d6c"
+dependencies = [
+ "form_urlencoded",
+ "idna",
+ "percent-encoding",
+]
+
 [[package]]
 name = "v_frame"
 version = "0.3.8"
@@ -1448,6 +2159,12 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "852e951cb7832cb45cb1169900d19760cfa39b82bc0ea9c0e5a14ae88411c98b"
 
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
 [[package]]
 name = "wasi"
 version = "0.11.0+wasi-snapshot-preview1"
@@ -1655,13 +2372,61 @@ checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
 
 [[package]]
 name = "winnow"
-version = "0.6.13"
+version = "0.6.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "59b5e5f6c299a3c7890b876a2a587f3115162487e704907d9b6cd29473052ba1"
+checksum = "56c52728401e1dc672a56e81e593e912aa54c78f40246869f78359a2bf24d29d"
 dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "zerocopy"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "zstd"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d789b1514203a1120ad2429eae43a7bd32b90976a7bb8a05f7ec02fa88cc23a"
+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "7.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1cd99b45c6bc03a018c8b8a86025678c87e55526064e38f9df301989dce7ec0a"
+dependencies = [
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.11+zstd.1.5.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75652c55c0b6f3e6f12eb786fe1bc960396bf05a1eb3bf1f3691c3610ac2e6d4"
+dependencies = [
+ "cc",
+ "pkg-config",
+]
+
 [[package]]
 name = "zune-core"
 version = "0.4.12"
diff --git a/README.md b/README.md
index c7105e2..52d57f6 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,8 @@
 [16](https://www.dropbox.com/scl/fi/3hf3ystbijpvu57f48yua/Lecture-16.MP4?rlkey=qntbm0gmjrt5xr3hjom3drktl&st=t3t5gzuj&dl=0&authuser=0)
 [17](https://www.dropbox.com/scl/fi/m182zj2hjvn95dckx3616/Lecture-17.MP4?rlkey=9k5f1qub18fkme81v6x1jzozk&st=pg3833ad&dl=0&authuser=0)
 [18](https://www.dropbox.com/scl/fi/zglhfknjwa39ywefwjox7/Lecture-18.MP4?rlkey=fmb6j1fmzk1zr1imyxbrivipr&st=iutxkn02&dl=0&authuser=0)
-19 20
+[19](https://www.dropbox.com/scl/fi/of3f02n3xdcuwfostpciu/Lecture-19.MP4?rlkey=068dvc8udx5nd6508s04j2xvw&st=88l3kw9v&dl=0&authuser=0)
+ 20
 
 - **DevStreams**:
 [1](https://www.dropbox.com/scl/fi/t7wfwubrl0361bjwxd5vx/DevStream-1.MP4?rlkey=4i319jzky1eqa3omcbpziuqum&st=t93zhcji&dl=0&authuser=0)
diff --git a/files/Cargo.toml b/files/Cargo.toml
new file mode 100644
index 0000000..96d2bbb
--- /dev/null
+++ b/files/Cargo.toml
@@ -0,0 +1,20 @@
+[workspace]
+
+members = [
+    "lesson01",
+    "lesson02",
+    "lesson05",
+    "lesson07",
+    "lesson09",
+    "lesson11/shared",
+    "lesson11/client",
+    "lesson11/server",
+    "lesson13/client13",
+    "lesson13/server13",
+    "lesson13/shared13",
+    "lesson15",
+    "lesson16",
+    "lesson17",
+    "lesson18",
+]
+resolver = "2"
diff --git a/files/README.md b/files/README.md
new file mode 100644
index 0000000..52d57f6
--- /dev/null
+++ b/files/README.md
@@ -0,0 +1,67 @@
+[![Rust](https://github.com/alembiq/rust-developer/actions/workflows/rust.yml/badge.svg)](https://github.com/alembiq/rust-developer/actions/workflows/rust.yml)
+
+
+# Some random notes and links ;)
+## Course related links
+- [classroom](https://classroom.google.com/c/NjU2NTMyOTI1NDY3)
+- [wiki](https://robot-dreams-rust.mag.wiki/)
+- [demo homeworks](https://github.com/Global-Classes-CZE/rust_developer)
+#### Recordings
+- **Lessons**: [01](https://www.dropbox.com/scl/fi/lxzebh9t16gbuv1nv7v30/Lecture-1.MP4?rlkey=undugghhtnh09leavcgaijn39&st=of9h4va9&dl=0&authuser=0)
+[02](https://www.dropbox.com/scl/fi/c5lfm2csaaf7vyz7mgz4c/Lecture-2.MP4?rlkey=pp2w2v2ig054mwf528ogysw4w&st=szbwx2i8&dl=0&authuser=0)
+[03](https://www.dropbox.com/scl/fi/e1w9x1p7uqcy2187zgunc/Lecture-3.MP4?rlkey=ocl82uzyoftcwum80wbhlomau&st=u7ybpxv1&dl=0&authuser=0)
+[04](https://www.dropbox.com/scl/fi/nfg8qzqlsz7wj7o4kw23p/Lecture-4.MP4?rlkey=gm1h6c3zsd2uqj9f5dah6h46k&st=6z34788w&dl=0&authuser=0)
+[05](https://www.dropbox.com/scl/fi/7tlhvg0835y86zi54i9lm/Lecture-5.MP4?rlkey=kkzoq6xq9246meb5316zi33kq&st=84ijzbfy&dl=0&authuser=0)
+[06](https://www.dropbox.com/scl/fi/lvm9n122m6c4rvlus5n8h/Lecture-6.MP4?rlkey=v7pvm0dk4khinpzh5984s9uyw&st=kbw3xtjp&dl=0&authuser=0)
+[07](https://www.dropbox.com/scl/fi/vzhb43f02dpu6ole88jry/Lecture-7.MP4?rlkey=250sy13x9fk3oi4c4dsqh2kla&st=z2m6j0xt&dl=0&authuser=0)
+[08](https://www.dropbox.com/scl/fi/6k06qmchswe25r99827fc/Lecture-8.MP4?rlkey=zlub7hiaxaio9rlhf8o3hvz1a&st=acznjiz9&dl=0&authuser=0)
+[09](https://www.dropbox.com/scl/fi/pflqn1qat4de3qy0alm74/Lecture-9.MP4?rlkey=plthacxnqaerwzdebjy3y4g2d&st=6v63rh1j&dl=0&authuser=0)
+[10](https://www.dropbox.com/scl/fi/5u4kfw7vkpx4p1q2h1x5d/Lecture-10.MP4?rlkey=i685dq56v03x3vl838a6hlv56&st=x3w2bjpr&dl=0&authuser=0)
+[11](https://www.dropbox.com/scl/fi/d4x7w3teq2ay7x1f9ax3m/Lecture-11.MP4?rlkey=4r2zjeejkscxa4x39pv2fnlkw&st=defy23bb&dl=0&authuser=0)
+[12](https://www.dropbox.com/scl/fi/af36dxkz7zloj7m5q29qa/Lecture-12.MP4?rlkey=y5lg76g08u21yrm2ib8i0bpfg&st=xh8g60jm&dl=0&authuser=0)
+[13](https://www.dropbox.com/scl/fi/hbp7mcyfp99iv0219v9vq/Lecture-13.MP4?rlkey=0799t0it8opno8ea685zllmmv&st=64awwmen&dl=0&authuser=0)
+[14](https://www.dropbox.com/scl/fi/u3dttgbaxgqdf8kh6fx3g/Lecture-14.MP4?rlkey=sbkut7t8m3xc45ppwsymv7zuj&st=xon10nni&dl=0&authuser=0)
+[15](https://www.dropbox.com/scl/fi/qpdeda3kx646jnwaf8j1s/Lecture-15.MP4?rlkey=b4ng5msydqt5zpm3pz05lqmm7&st=edb0in9i&dl=0&authuser=0)
+[16](https://www.dropbox.com/scl/fi/3hf3ystbijpvu57f48yua/Lecture-16.MP4?rlkey=qntbm0gmjrt5xr3hjom3drktl&st=t3t5gzuj&dl=0&authuser=0)
+[17](https://www.dropbox.com/scl/fi/m182zj2hjvn95dckx3616/Lecture-17.MP4?rlkey=9k5f1qub18fkme81v6x1jzozk&st=pg3833ad&dl=0&authuser=0)
+[18](https://www.dropbox.com/scl/fi/zglhfknjwa39ywefwjox7/Lecture-18.MP4?rlkey=fmb6j1fmzk1zr1imyxbrivipr&st=iutxkn02&dl=0&authuser=0)
+[19](https://www.dropbox.com/scl/fi/of3f02n3xdcuwfostpciu/Lecture-19.MP4?rlkey=068dvc8udx5nd6508s04j2xvw&st=88l3kw9v&dl=0&authuser=0)
+ 20
+
+- **DevStreams**:
+[1](https://www.dropbox.com/scl/fi/t7wfwubrl0361bjwxd5vx/DevStream-1.MP4?rlkey=4i319jzky1eqa3omcbpziuqum&st=t93zhcji&dl=0&authuser=0)
+[2](https://www.dropbox.com/scl/fi/n8mk9lfylmgtpfnnr15lr/DevStream-2.MP4?rlkey=3ixyjsujkif074729ttavj4l8&st=c1c3hfu7&dl=0&authuser=0)
+ 3
+
+#### Classmates homeworks ;)
+- [abergasov](https://github.com/abergasov/rd_rust)
+- [bhoglo](https://github.com/bhoglo/projects/)
+- [bieleluk](https://github.com/bieleluk/rust-developer)
+- [b-rowan](https://github.com/b-rowan/braiins-rust-course)
+- [czJanKrejci](https://github.com/czJanKrejci/RustDeveloper)
+- [HarryRybacki](https://github.com/HarryRybacki/rust_developer)
+- [Hugoargui](https://github.com/Hugoargui/rust/)
+- [i4nf0x](https://github.com/i4nf0x/rust_course/)
+- [JakubKuljovsky](https://github.com/JakubKuljovsky/rust_homeworks)
+- [jiri-sedlacek](https://github.com/jiri-sedlacek/rust_course)
+- Ma5thewbond [1](https://github.com/ma5thewbond/rust_01_helloworld) [5](https://github.com/ma5thewbond/rust_05_csv_parser/tree/main) [7](https://github.com/ma5thewbond/rust_07_threads)
+[9](https://github.com/ma5thewbond/rust_09_networking) [15](https://github.com/ma5thewbond/rust_15_async_chat)
+- [moribusV](https://github.com/moribusV/rustCourse/)
+- [nlukic97](https://github.com/nlukic97/rust1)
+- [oceanbreath](https://github.com/oceanbreath/rust_course)
+- [smoofy24](https://github.com/smoofy24/Rust_project)
+- [Standazwicky](https://github.com/Standazwicky/rust_homeworks)
+
+# Tools/links
+- [playground](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021)
+
+## Environment
+So far, I'm running these:
+- [Rust on NixOs](https://nixos.wiki/wiki/Rust)
+- [Rust overlay](https://github.com/oxalica/rust-overlay)
+- [direnv to get `nix develop` to VS terminal](https://marketplace.visualstudio.com/items?itemName=mkhl.direnv)
+
+Alternatives I didn't look into yet
+- [crane](https://github.com/ipetkov/crane)
+- [naersk](https://github.com/nix-community/naersk)
+- [fenix](https://github.com/nix-community/fenix)
diff --git a/flake.nix b/flake.nix
index 98c423e..80e22f1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -22,8 +22,8 @@
             openssl
             pkg-config
             bacon
-            # rust-bin.stable.latest.default
-            rust-bin.beta.latest.default
+            rust-bin.stable.latest.default
+            # rust-bin.beta.latest.default
           ];
         };
       }
diff --git a/lesson18/Cargo.toml b/lesson18/Cargo.toml
index eed6ea7..3c575d8 100644
--- a/lesson18/Cargo.toml
+++ b/lesson18/Cargo.toml
@@ -13,3 +13,6 @@ parking_lot = "0.12.3"
 eyre = "0.6.12"
 prometheus = "0.13.4"
 lazy_static = "1.5.0"
+actix-web = "4.8.0"
+futures = "0.3.30"
+tokio = { version = "1.38.0", features = ["full"] }
diff --git a/lesson18/README.md b/lesson18/README.md
index 38ae780..3f85cf9 100644
--- a/lesson18/README.md
+++ b/lesson18/README.md
@@ -5,7 +5,7 @@ Server and client that can send messages, files and images (yes, those are also
 ## Usage
 You can simply run the `server` and it will start listening on 127.0.0.1:11111. Or you can start it on a specific IP and port - `server18 10.0.42.101:1234`. The same parameter works also for the `client`, it also tries to connect to the same default as server unless you provide server address specifically.
 
-The server also provides some [Prometheus](https://prometheus.io/) metrics you can scrape on `your_ip:9090/metrics`. This will allow you to monitor number of messages processed by the chat app, same as number of active clients and all the client over the runtime of the server.
+The server also provides some [Prometheus](https://prometheus.io/) metrics you can scrape on `your_ip:11112/metrics`. This will allow you to monitor number of messages processed by the chat app, same as number of active clients and all the client over the runtime of the server.
 
 # Requirements for this homework ;)
 
diff --git a/lesson18/docker/docker-compose.yml b/lesson18/docker/docker-compose.yml
index 1c339a4..c18679d 100644
--- a/lesson18/docker/docker-compose.yml
+++ b/lesson18/docker/docker-compose.yml
@@ -12,6 +12,6 @@ services:
     environment:
     - GF_SECURITY_ADMIN_PASSWORD=admin
     ports:
-    - "3123:3000"
+    - "3000:3000"
     depends_on:
     - prometheus
diff --git a/lesson18/docker/prometheus.yml b/lesson18/docker/prometheus.yml
index d3cf925..e821eaa 100644
--- a/lesson18/docker/prometheus.yml
+++ b/lesson18/docker/prometheus.yml
@@ -4,4 +4,4 @@ global:
 scrape_configs:
   - job_name: 'rust_application'
     static_configs:
-    - targets: ['<url>:10002']
+    - targets: ['<url>:11112']
diff --git a/lesson18/src/bin/server18.rs b/lesson18/src/bin/server18.rs
index b1ef9b3..6de8bc2 100644
--- a/lesson18/src/bin/server18.rs
+++ b/lesson18/src/bin/server18.rs
@@ -4,21 +4,24 @@
 
 use std::collections::HashMap;
 use std::env;
+use std::io::Result as IoResult;
 use std::net::{SocketAddr, TcpListener, TcpStream};
 use std::sync::Arc;
 use std::thread;
 
+use actix_web::{http::StatusCode, web, App, HttpResponse, HttpServer, Responder};
 use eyre::{bail, Result};
-use parking_lot::Mutex;
-// use prometheus::{Gauge, Opts, Registry, Counter};
 use lazy_static::lazy_static;
+use parking_lot::Mutex;
 use prometheus::{
-    self, register_int_counter, register_int_gauge, Encoder, IntCounter, IntGauge, TextEncoder,
+    self, gather, register_int_counter, register_int_gauge, Encoder, IntCounter, IntGauge,
+    Registry, TextEncoder,
 };
 
 use lesson18::{incoming_message, outgoing_message, server_address, timestamp, MessageType};
 
 lazy_static! {
+    static ref REGISTRY: Registry = Registry::new();
     static ref COUNTER_MESSAGE_TEXT: IntCounter =
         register_int_counter!("message_text", "Text messages delivered").unwrap();
     static ref COUNTER_MESSAGE_FILE: IntCounter =
@@ -26,27 +29,52 @@ lazy_static! {
     static ref COUNTER_MESSAGE_IMAGE: IntCounter =
         register_int_counter!("message_image", "Images delivered").unwrap();
     static ref COUNTER_CLIENTS: IntCounter =
-        register_int_counter!("clients", "Clients over time").unwrap();
+        register_int_counter!("clients_runtime", "Clients over time").unwrap();
     static ref GAUGE_CLIENTS: IntGauge =
         register_int_gauge!("clients_current", "Active clients").unwrap();
 }
 
-fn main() -> Result<()> {
+/// Generates Prometheus metrics
+async fn metrics() -> impl Responder {
+    let encoder = TextEncoder::new();
+    let mut buf = vec![];
+
+    if let Err(e) = encoder.encode(&gather(), &mut buf) {
+        eprintln!("Failed to collect metrics: {e}");
+        return HttpResponse::build(StatusCode::INTERNAL_SERVER_ERROR)
+            .body("Failed to collect metrics!");
+    }
+    HttpResponse::build(StatusCode::OK).body(String::from_utf8(buf).unwrap())
+}
+
+/// Webserver for /metrics
+async fn metrics_http() -> IoResult<()> {
+    let _ = HttpServer::new(|| App::new().route("/metrics", web::get().to(metrics)))
+        .bind("0.0.0.0:11112")
+        .expect("Failed to bind metrics endpoint")
+        .run()
+        .await;
+
+    Ok(())
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
     let server_address: String = server_address(env::args().collect());
     println!("{} Starting server on {}!", timestamp(), server_address);
 
-    // Register & measure some metrics.
-    let mut buffer = Vec::new();
-    let encoder = TextEncoder::new();
-    // Gather the metrics.
-    let metric_families = prometheus::gather();
-    // Encode them to send.
-    encoder.encode(&metric_families, &mut buffer).unwrap();
-    let output = String::from_utf8(buffer.clone()).unwrap();
-    println!("{output:?}");
+    let metrics_handle = tokio::spawn(async {
+        let _ = metrics_http().await;
+    });
+    let server_handle = tokio::spawn(async {
+        let _ = listen_and_accept(server_address);
+    });
+
+    metrics_handle.await.unwrap();
+    server_handle.await.unwrap();
 
-    // Listen and process clients
-    listen_and_accept(server_address)?;
+    //TODO find a way how to terminate the server ;)
+    // listen_and_accept(server_address);
 
     Ok(())
 }
@@ -79,6 +107,7 @@ fn listen_and_accept(address: String) -> Result<()> {
                 Ok(msg) => msg,
                 Err(e) => {
                     eprintln!("{} {addr} stream interrupted: {e}", timestamp());
+                    // TODO announce disconnected client to everyone and remove everywhere?
                     GAUGE_CLIENTS.dec();
                     break;
                 }
@@ -86,7 +115,7 @@ fn listen_and_accept(address: String) -> Result<()> {
 
             // message other clients
             let mut clients_lock = clients_clone.lock();
-            let mut peers_to_remove = vec![];
+            let peers_to_remove = vec![];
             for (peer_addr, peer_stream) in clients_lock.iter_mut() {
                 if *peer_addr == addr {
                     continue;
@@ -94,17 +123,17 @@ fn listen_and_accept(address: String) -> Result<()> {
 
                 if let Err(e) = outgoing_message(peer_stream, &message) {
                     eprintln!("{} failed to send message: {message:?} -> {e}", timestamp());
-                    peers_to_remove.push(*peer_addr);
                 }
             }
-
+            // remove dead clients
             for peer_addr in peers_to_remove {
                 clients_lock.remove(&peer_addr);
+                println!("remove dead client {}", &peer_addr);
             }
 
             drop(clients_lock);
 
-            //MESSAGE SNEAKPEAK
+            //MESSAGE SNEAKPEAK and COUNTERS
             match message {
                 MessageType::Text(text) => {
                     println!("{} {addr}: {text:?}", timestamp());