nghttpd: Add -c, --header-table-size option

src/HttpServer.cc

@@ -73,7 +73,8 @@ Config::Config()
     verify_client(false),
     no_tls(false),
     no_flow_control(false),
-    output_upper_thres(1024*1024)
+    output_upper_thres(1024*1024),
+    header_table_size(-1)
 {}
 
 Request::Request(int32_t stream_id)
@@ -362,7 +363,7 @@ int Http2Handler::on_connect()
   if(r != 0) {
     return r;
   }
-  nghttp2_settings_entry entry[2];
+  nghttp2_settings_entry entry[3];
   size_t niv = 1;
   entry[0].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS;
   entry[0].value = 100;
@@ -371,6 +372,11 @@ int Http2Handler::on_connect()
     entry[niv].value = 1;
     ++niv;
   }
+  if(config.header_table_size >= 0) {
+    entry[niv].settings_id = NGHTTP2_SETTINGS_HEADER_TABLE_SIZE;
+    entry[niv].value = config.header_table_size;
+    ++niv;
+  }
   r = nghttp2_submit_settings(session_, NGHTTP2_FLAG_NONE, entry, niv);
   if(r != 0) {
     return r;

src/HttpServer.h

@@ -60,6 +60,7 @@ struct Config {
   bool no_tls;
   bool no_flow_control;
   size_t output_upper_thres;
+  ssize_t header_table_size;
   Config();
 };
 

src/nghttpd.cc

@@ -76,6 +76,8 @@ void print_help(std::ostream& out)
       << "    -f, --no-flow-control\n"
       << "                       Disables connection and stream level flow\n"
       << "                       controls.\n"
+      << "    -c, --header-table-size=<N>\n"
+      << "                       Specify decoder header table size.\n"
       << "    --color            Force colored log output.\n"
       << "    -h, --help         Print this help.\n"
       << std::endl;
@@ -95,12 +97,14 @@ int main(int argc, char **argv)
       {"verbose", no_argument, nullptr, 'v'},
       {"verify-client", no_argument, nullptr, 'V'},
       {"no-flow-control", no_argument, nullptr, 'f'},
+      {"header-table-size", required_argument, nullptr, 'c'},
       {"no-tls", no_argument, &flag, 1},
       {"color", no_argument, &flag, 2},
       {nullptr, 0, nullptr, 0}
     };
     int option_index = 0;
-    int c = getopt_long(argc, argv, "DVd:fhv", long_options, &option_index);
+    int c = getopt_long(argc, argv, "DVc:d:fhv", long_options, &option_index);
+    char *end;
     if(c == -1) {
       break;
     }
@@ -123,6 +127,13 @@ int main(int argc, char **argv)
     case 'v':
       config.verbose = true;
       break;
+    case 'c':
+      config.header_table_size = strtol(optarg, &end, 10);
+      if(errno == ERANGE || *end != '\0') {
+        std::cerr << "-c: Bad option value: " << optarg << std::endl;
+        exit(EXIT_FAILURE);
+      }
+      break;
     case '?':
       exit(EXIT_FAILURE);
     case 0: