bugfix: because of the recent API behaviour changes in nginx 1.2.6+ and 1.3.9+, the "http request count is zero" alert might happen when ngx.req.read_body() was called to read the request body and nginx failed to send out the "100 Continue" (short) response (like client connection early abortion and etc). thanks stonehuzhan for reporting this issue.

Author: agentzh

src/ngx_http_lua_req_body.c

@@ -112,12 +112,20 @@ ngx_http_lua_ngx_req_read_body(lua_State *L)
 
     rc = ngx_http_read_client_request_body(r, ngx_http_lua_req_body_post_read);
 
+#if (nginx_version < 1002006) ||                                             \
+        (nginx_version >= 1003000 && nginx_version < 1003009)
     r->main->count--;
+#endif
 
     if (rc == NGX_ERROR || rc >= NGX_HTTP_SPECIAL_RESPONSE) {
         return luaL_error(L, "failed to read request body");
     }
 
+#if (nginx_version >= 1002006 && nginx_version < 1003000) ||                 \
+        nginx_version >= 1003009
+    r->main->count--;
+#endif
+
     if (rc == NGX_AGAIN) {
         ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                 "lua read buffered request body requires I/O interruptions");

t/044-req-body.t

@@ -33,6 +33,7 @@ hello, world
 hello, world
 --- no_error_log
 [error]
+[alert]
 
 
 
@@ -1314,3 +1315,30 @@ failed to get req socket: request body already exists
 --- no_error_log
 a client request body is buffered to a temporary file
 
+
+
+=== TEST 41: failed to write 100 continue
+--- config
+    location = /test {
+        content_by_lua '
+            ngx.sleep(0.01)
+            ngx.req.read_body()
+            ngx.say(ngx.var.request_body)
+        ';
+    }
+--- request
+POST /test
+hello, world
+--- more_headers
+Expect: 100-Continue
+--- abort
+--- timeout: 0.001
+--- wait: 0.1
+--- ignore_response
+hello, world
+--- error_log
+failed to read request body
+--- no_error_log
+[alert]
+http finalize request: 500, "/test?" a:1, c:0
+