HTTP/2: add debug logging of pseudo-headers and control frames. Change-Id: Ia85daa4eb0142baf57843627059b17fb08a150a4 Signed-off-by: Piotr Sikora <piotrsikora@google.com> Reviewed-on: https://nginx-review.googlesource.com/2829 Reviewed-by: Lizan Zhou <zlizan@google.com>

diff --git a/src/http/v2/ngx_http_v2.c b/src/http/v2/ngx_http_v2.c
index d7c9baf..11c0578 100644
--- a/src/http/v2/ngx_http_v2.c
+++ b/src/http/v2/ngx_http_v2.c

@@ -1590,6 +1590,10 @@
         rc = ngx_http_v2_pseudo_header(r, header);
 
         if (rc == NGX_OK) {
+            ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                           "http2 http header: \":%V: %V\"",
+                           &header->name, &header->value);
+
             return ngx_http_v2_state_header_complete(h2c, pos, end);
         }
 
@@ -1965,6 +1969,9 @@
             return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_SIZE_ERROR);
         }
 
+        ngx_log_debug0(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
+                       "http2 SETTINGS frame ack:1");
+
         h2c->settings_ack = 1;
 
         return ngx_http_v2_state_complete(h2c, pos, end);
@@ -1978,6 +1985,9 @@
         return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_SIZE_ERROR);
     }
 
+    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
+                   "http2 SETTINGS frame ack:0");
+
     ngx_http_v2_send_settings(h2c, 1);
 
     return ngx_http_v2_state_settings_params(h2c, pos, end);
@@ -2093,12 +2103,16 @@
     }
 
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
-                   "http2 PING frame, flags: %ud", h2c->state.flags);
+                   "http2 PING frame ack:%ud",
+                   h2c->state.flags & NGX_HTTP_V2_ACK_FLAG ? 1 : 0);
 
     if (h2c->state.flags & NGX_HTTP_V2_ACK_FLAG) {
         return ngx_http_v2_state_skip(h2c, pos, end);
     }
 
+    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, h2c->connection->log, 0,
+                   "http2 send PING frame ack:1");
+
     frame = ngx_http_v2_get_frame(h2c, NGX_HTTP_V2_PING_SIZE,
                                   NGX_HTTP_V2_PING_FRAME,
                                   NGX_HTTP_V2_ACK_FLAG, 0);