diff --git a/src/main/java/org/teacon/chahoutan/entity/Post.java b/src/main/java/org/teacon/chahoutan/entity/Post.java
index 2548715..07d1d95 100644
--- a/src/main/java/org/teacon/chahoutan/entity/Post.java
+++ b/src/main/java/org/teacon/chahoutan/entity/Post.java
@@ -3,6 +3,7 @@
 import org.teacon.chahoutan.ChahoutanConfig;
 
 import javax.persistence.*;
+import java.net.URI;
 import java.time.Instant;
 import java.time.OffsetDateTime;
 import java.util.HashSet;
@@ -42,6 +43,11 @@ public Integer getId()
         return this.id;
     }
 
+    public URI getBackendUrl() {
+        var urlPrefix = URI.create(ChahoutanConfig.BACKEND_URL_PREFIX);
+        return urlPrefix.resolve("v1/posts/" + this.id);
+    }
+
     public Revision getRevision()
     {
         return this.revision;
diff --git a/src/main/java/org/teacon/chahoutan/entity/Revision.java b/src/main/java/org/teacon/chahoutan/entity/Revision.java
index fba981e..44e7213 100644
--- a/src/main/java/org/teacon/chahoutan/entity/Revision.java
+++ b/src/main/java/org/teacon/chahoutan/entity/Revision.java
@@ -97,6 +97,11 @@ public String getText()
         return this.text;
     }
 
+    public URI getBackendUrl() {
+        var urlPrefix = URI.create(ChahoutanConfig.BACKEND_URL_PREFIX);
+        return urlPrefix.resolve("v1/posts/" + this.id);
+    }
+
     public List<String> getAnchors()
     {
         return this.anchors.entrySet().stream().sorted(Map.Entry.comparingByKey()).map(Map.Entry::getKey).toList();
@@ -126,8 +131,10 @@ public Map<String, String> getFootnoteUrls()
     {
         var footnoteCount = this.footnotes.size();
         var map = new LinkedHashMap<String, String>(footnoteCount);
+        var urlPrefix = URI.create(ChahoutanConfig.FRONTEND_URL_PREFIX);
         for (int i = 0; i < footnoteCount; ++i) {
-            map.put(String.format("[%d]", i + 1), "#footnote-" + i);
+            var url = urlPrefix.resolve(this.post.getId() + "#footnote-" + i);
+            map.put(String.format("[%d]", i + 1), url.toASCIIString());
         }
         return Map.copyOf(map);
     }
diff --git a/src/main/java/org/teacon/chahoutan/network/PostResponse.java b/src/main/java/org/teacon/chahoutan/network/PostResponse.java
index b4ace94..41a0dfa 100644
--- a/src/main/java/org/teacon/chahoutan/network/PostResponse.java
+++ b/src/main/java/org/teacon/chahoutan/network/PostResponse.java
@@ -32,15 +32,12 @@ public static PostResponse from(Post post)
     {
         var revision = post.getRevision();
         var revisionName = revision.getTitle();
-        var urlPrefix = URI.create(ChahoutanConfig.BACKEND_URL_PREFIX);
-        var url = urlPrefix.resolve("v1/posts/" + post.getId());
-        var revisionUrl = urlPrefix.resolve("v1/posts/" + revision.getId());
         var type = post.getId() <= Post.getLastPublicPostId(null) ? "post" : "draft";
         var editors = post.getEditors().stream().sorted().toList();
         var images = revision.getImages().stream().map(ImageResponse::from).toList();
-        return new PostResponse(post.getId(), url, type,
-                revisionName, revision.getText(), revision.getId(),
-                revisionUrl, editors, revision.getAnchors(), revision.getAnchorUrls(),
+        return new PostResponse(post.getId(), post.getBackendUrl(),
+                type, revisionName, revision.getText(), revision.getId(),
+                revision.getBackendUrl(), editors, revision.getAnchors(), revision.getAnchorUrls(),
                 images, revision.getFootnotes(), revision.getFootnoteUrls(), post.getPublishTime());
     }
 
@@ -49,15 +46,13 @@ public static PostResponse from(Revision revision)
         var post = revision.getPost();
         var revisionName = revision.getTitle();
         var isPost = post.getRevision() != null && post.getRevision().getId().equals(revision.getId());
-        var urlPrefix = URI.create(ChahoutanConfig.BACKEND_URL_PREFIX);
-        var url = isPost ? urlPrefix.resolve("v1/posts/" + post.getId()) : null;
-        var revisionUrl = urlPrefix.resolve("v1/posts/" + revision.getId());
         var type = isPost ? post.getId() <= Post.getLastPublicPostId(null) ? "post" : "draft" : "revision";
         var editors = isPost ? post.getEditors().stream().sorted().toList() : null;
         var images = revision.getImages().stream().map(ImageResponse::from).toList();
-        return new PostResponse(post.getId(), url, type,
-                revisionName, revision.getText(), revision.getId(),
-                revisionUrl, editors, revision.getAnchors(), revision.getAnchorUrls(),
+        return new PostResponse(post.getId(),
+                isPost ? post.getBackendUrl() : null,
+                type, revisionName, revision.getText(), revision.getId(),
+                revision.getBackendUrl(), editors, revision.getAnchors(), revision.getAnchorUrls(),
                 images, revision.getFootnotes(), revision.getFootnoteUrls(), post.getPublishTime());
     }
 }