nghttpx: Fix broken server push after HTTP upgrade

src/shrpx_http2_upstream.cc

@@ -106,6 +106,35 @@ int on_stream_close_callback(nghttp2_session *session, int32_t stream_id,
 int Http2Upstream::upgrade_upstream(HttpsUpstream *http) {
   int rv;
 
+  // to deduce :scheme and :authority, first we have to parse request
+  // URI.
+  http_parser_url u = {};
+  auto &url = http->get_downstream()->get_request_path();
+
+  std::string scheme, authority;
+  rv = http_parser_parse_url(url.c_str(), url.size(), 0, &u);
+  if (rv == 0) {
+    http2::copy_url_component(scheme, &u, UF_SCHEMA, url.c_str());
+    http2::copy_url_component(authority, &u, UF_HOST, url.c_str());
+  }
+  if (scheme.empty()) {
+    if (handler_->get_ssl()) {
+      scheme = "https";
+    } else {
+      scheme = "http";
+    }
+  }
+  if (!authority.empty()) {
+    if (authority.find(":") != std::string::npos) {
+      authority = "[" + authority;
+      authority += "]";
+    }
+    if (u.field_set & (1 << UF_PORT)) {
+      authority += ":";
+      authority += util::utos(u.port);
+    }
+  }
+
   auto http2_settings = http->get_downstream()->get_http2_settings();
   util::to_base64(http2_settings);
 
@@ -129,6 +158,8 @@ int Http2Upstream::upgrade_upstream(HttpsUpstream *http) {
   downstream->reset_upstream_rtimer();
   downstream->set_stream_id(1);
   downstream->set_priority(0);
+  downstream->set_request_http2_authority(authority);
+  downstream->set_request_http2_scheme(scheme);
 
   downstream_queue_.add_active(std::move(downstream));
 
@@ -1525,11 +1556,25 @@ int Http2Upstream::submit_push_promise(const std::string &path,
   int rv;
   std::vector<nghttp2_nv> nva;
   nva.reserve(downstream->get_request_headers().size());
+
+  // juse use "GET" for now
+  nva.push_back(http2::make_nv_ll(":method", "GET"));
+  nva.push_back(
+      http2::make_nv(":scheme", downstream->get_request_http2_scheme()));
+  nva.push_back(http2::make_nv_ls(":path", path));
+  auto &authority = downstream->get_request_http2_authority();
+  if (!authority.empty()) {
+    nva.push_back(http2::make_nv(":authority", authority));
+  }
+
   for (auto &kv : downstream->get_request_headers()) {
     switch (kv.token) {
     // TODO generate referer
     case http2::HD__AUTHORITY:
     case http2::HD__SCHEME:
+    case http2::HD__METHOD:
+    case http2::HD__PATH:
+      continue;
     case http2::HD_ACCEPT_ENCODING:
     case http2::HD_ACCEPT_LANGUAGE:
     case http2::HD_CACHE_CONTROL:
@@ -1537,13 +1582,6 @@ int Http2Upstream::submit_push_promise(const std::string &path,
     case http2::HD_USER_AGENT:
       nva.push_back(http2::make_nv(kv.name, kv.value, kv.no_index));
       break;
-    case http2::HD__METHOD:
-      // juse use "GET" for now
-      nva.push_back(http2::make_nv_lc(":method", "GET"));
-      continue;
-    case http2::HD__PATH:
-      nva.push_back(http2::make_nv_ls(":path", path));
-      continue;
     }
   }