Improve tolerance of If-Modified-Since time point comparison (#168)

Signed-off-by: Juan Cruz Viotti <[email protected]>

src/httpserver/request.cc

@@ -71,9 +71,9 @@ auto ServerRequest::header_if_modified_since(
       return true;
     }
 
-    // We have seen than on Docker, time comparison can be flaky, but adding
-    // a bit of tolerance leads to more consistent behavior.
-    return (if_modified_since.value() + std::chrono::microseconds(100)) <
+    // Time comparison can be flaky, but adding a bit of tolerance leads
+    // to more consistent behavior.
+    return (if_modified_since.value() + std::chrono::milliseconds(1)) <
            last_modified;
     // If there is an error parsing the `If-Modified-Since` timestamp, don't
     // abort, but lean on the safe side: the requested resource has been