From 165cab7a2952ff82155d44af1c34a80e293c65f5 Mon Sep 17 00:00:00 2001
From: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
Date: Mon, 17 Aug 2015 23:47:35 +0900
Subject: [PATCH] nghttpd: Support HEAD request

---
 src/HttpServer.cc | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/src/HttpServer.cc b/src/HttpServer.cc
index 01624d33..8ca4de00 100644
--- a/src/HttpServer.cc
+++ b/src/HttpServer.cc
@@ -1106,23 +1106,26 @@ void prepare_response(Stream *stream, Http2Handler *hd,
       return;
     }
 
-    if (last_mod_found && static_cast<time_t>(buf.st_mtime) <= last_mod) {
-      close(file);
-      hd->submit_response("304", stream->stream_id, nullptr);
-
-      return;
-    }
-
     file_ent = sessions->cache_fd(
         path, FileEntry(path, buf.st_size, buf.st_mtime, file));
-  } else if (last_mod_found && file_ent->mtime <= last_mod) {
-    sessions->release_fd(file_ent->path);
+  }
+
+  stream->file_ent = file_ent;
+
+  if (last_mod_found && file_ent->mtime <= last_mod) {
     hd->submit_response("304", stream->stream_id, nullptr);
 
     return;
   }
 
-  stream->file_ent = file_ent;
+  auto &method = http2::get_header(stream->hdidx, http2::HD__METHOD,
+                                   stream->headers)->value;
+  if (method == "HEAD") {
+    hd->submit_file_response("200", stream, file_ent->mtime, file_ent->length,
+                             nullptr);
+    return;
+  }
+
   stream->body_length = file_ent->length;
 
   nghttp2_data_provider data_prd;