fix(ext-plugin): avoid using 0 as the default http status code (#4734)

apisix/plugins/ext-plugin/init.lua

@@ -431,7 +431,12 @@ local rpc_handlers = {
                 end
                 body = ffi_str(body, len)
             end
-            return true, nil, stop:Status(), body
+            local code = stop:Status()
+            -- avoid using 0 as the default http status code
+            if code == 0 then
+                 code = 200
+            end
+            return true, nil, code, body
         end
 
         if action_type == http_req_call_action.Rewrite then

t/lib/ext-plugin.lua

@@ -185,7 +185,9 @@ function _M.go(case)
             local vec = builder:EndVector(len)
 
             http_req_call_stop.Start(builder)
-            http_req_call_stop.AddStatus(builder, 405)
+            if case.check_default_status ~= true then
+                http_req_call_stop.AddStatus(builder, 405)
+            end
             http_req_call_stop.AddBody(builder, b)
             http_req_call_stop.AddHeaders(builder, vec)
             local action = http_req_call_stop.End(builder)

t/plugin/ext-plugin/http-req-call.t

@@ -517,3 +517,23 @@ GET /hello
 --- access_log
 GET /plugin_proxy_rewrite_args%3Fa=2
 --- error_code: 404
+
+
+
+=== TEST 18: stop without setting status code
+--- request
+GET /hello
+--- response_body chomp
+cat
+--- extra_stream_config
+    server {
+        listen unix:$TEST_NGINX_HTML_DIR/nginx.sock;
+
+        content_by_lua_block {
+            local ext = require("lib.ext-plugin")
+            ext.go({stop = true, check_default_status = true})
+        }
+    }
+--- response_headers
+X-Resp: foo
+X-Req: bar