i2ptunnel: Fix HTTP websockets by passing through

Connection headers containing "upgrade" (ticket #2422)
Server-side change only. Client-side in previous commit.

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/I2PTunnelHTTPServer.java

@@ -516,7 +516,12 @@ public class I2PTunnelHTTPServer extends I2PTunnelServer {
             }
             if (spoofHost != null)
                 setEntry(headers, "Host", spoofHost);
-            setEntry(headers, "Connection", "close");
+
+            // Force Connection: close, unless websocket
+            String conn = getEntryOrNull(headers, "Connection");
+            if (conn == null || !conn.toLowerCase(Locale.US).contains("upgrade"))
+                setEntry(headers, "Connection", "close");
+
             // we keep the enc sent by the browser before clobbering it, since it may have 
             // been x-i2p-gzip
             String enc = getEntryOrNull(headers, "Accept-Encoding");
@@ -1044,6 +1049,8 @@ public class I2PTunnelHTTPServer extends I2PTunnelServer {
                     name = "User-Agent";
                 else if ("referer".equals(lcName))
                     name = "Referer";
+                else if ("connection".equals(lcName))
+                    name = "Connection";
 
                 // For incoming, we remove certain headers to prevent spoofing.
                 // For outgoing, we remove certain headers to improve anonymity.

history.txt

@@ -2,6 +2,8 @@
  * I2CP:
    - Remove revocation private key from CreateLeaseset2 message
    - Use correct key to sign SessionConfig with offline keys
+ * i2ptunnel: Fix HTTP websockets by passing through
+   Connection headers containing "upgrade" (ticket #2422)
  * Streaming:
    - Support offline signatures (proposal 123)
    - Don't send FROM in RESET, not required since 0.9.20

router/java/src/net/i2p/router/RouterVersion.java

@@ -18,7 +18,7 @@ public class RouterVersion {
     /** deprecated */
     public final static String ID = "Monotone";
     public final static String VERSION = CoreVersion.VERSION;
-    public final static long BUILD = 5;
+    public final static long BUILD = 6;
 
     /** for example "-test" */
     public final static String EXTRA = "";