5xx
response status codeSimilar 5xx
status codes such as 500, 502, 503, etc., are the status codes in response to a server error. When a request has a 5xx
status code; it may come from APISIX
or Upstream
. How to identify the source of these response status codes is a very meaningful thing. It can quickly help us determine the problem. (When modifying the configuration show_upstream_status_in_response_header
in conf/config.yaml
to true
, all upstream status codes will be returned, not only 5xx
status.)
5xx
response status codeIn the response header of the request, through the response header of X-APISIX-Upstream-Status
, we can effectively identify the source of the 5xx
status code. When the 5xx
status code comes from Upstream
, the response header X-APISIX-Upstream-Status
can be seen in the response header, and the value of this response header is the response status code. When the 5xx
status code is derived from APISIX
, there is no response header information of X-APISIX-Upstream-Status
in the response header. That is, only when the status code of 5xx
is derived from Upstream will the X-APISIX-Upstream-Status
response header appear.
Example 1:
502
response status code comes fromUpstream
(IP address is not available)
$ curl http://127.0.0.1:9180/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d ' { "methods": ["GET"], "upstream": { "nodes": { "127.0.0.1:1": 1 }, "type": "roundrobin" }, "uri": "/hello" }'
Test:
$ curl http://127.0.0.1:9080/hello -v ...... < HTTP/1.1 502 Bad Gateway < Date: Wed, 25 Nov 2020 14:40:22 GMT < Content-Type: text/html; charset=utf-8 < Content-Length: 154 < Connection: keep-alive < Server: APISIX/2.0 < X-APISIX-Upstream-Status: 502 < <html> <head><title>502 Bad Gateway</title></head> <body> <center><h1>502 Bad Gateway</h1></center> <hr><center>openresty</center> </body> </html>
It has a response header of X-APISIX-Upstream-Status: 502
.
Example 2:
502
response status code comes fromAPISIX
$ curl http://127.0.0.1:9180/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d ' { "plugins": { "fault-injection": { "abort": { "http_status": 500, "body": "Fault Injection!\n" } } }, "uri": "/hello" }'
Test:
$ curl http://127.0.0.1:9080/hello -v ...... < HTTP/1.1 500 Internal Server Error < Date: Wed, 25 Nov 2020 14:50:20 GMT < Content-Type: text/plain; charset=utf-8 < Transfer-Encoding: chunked < Connection: keep-alive < Server: APISIX/2.0 < Fault Injection!
There is no response header for X-APISIX-Upstream-Status
.
Example 3:
Upstream
has multiple nodes, and all nodes are unavailable
$ curl http://127.0.0.1:9180/apisix/admin/upstreams/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d ' { "nodes": { "127.0.0.3:1": 1, "127.0.0.2:1": 1, "127.0.0.1:1": 1 }, "retries": 2, "type": "roundrobin" }'
$ curl http://127.0.0.1:9180/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d ' { "uri": "/hello", "upstream_id": "1" }'
Test:
$ curl http://127.0.0.1:9080/hello -v < HTTP/1.1 502 Bad Gateway < Date: Wed, 25 Nov 2020 15:07:34 GMT < Content-Type: text/html; charset=utf-8 < Content-Length: 154 < Connection: keep-alive < Server: APISIX/2.0 < X-APISIX-Upstream-Status: 502, 502, 502 < <html> <head><title>502 Bad Gateway</title></head> <body> <center><h1>502 Bad Gateway</h1></center> <hr><center>openresty</center> </body> </html>
It has a response header of X-APISIX-Upstream-Status: 502, 502, 502
.