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150 lines
4.4 KiB
Markdown
150 lines
4.4 KiB
Markdown
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<!--
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership.
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# The ASF licenses this file to You under the Apache License, Version 2.0
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# (the "License"); you may not use this file except in compliance with
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# the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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-->
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## `5xx` response status code
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Similar `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.
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## How to identify the source of the `5xx` response status code
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In 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.
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## Example
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>Example 1: `502` response status code comes from `Upstream` (IP address is not available)
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```shell
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$ curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"methods": ["GET"],
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"upstream": {
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"nodes": {
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"127.0.0.1:1": 1
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},
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"type": "roundrobin"
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},
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"uri": "/hello"
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}'
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```
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Test:
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```shell
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$ curl http://127.0.0.1:9080/hello -v
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......
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< HTTP/1.1 502 Bad Gateway
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< Date: Wed, 25 Nov 2020 14:40:22 GMT
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< Content-Type: text/html; charset=utf-8
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< Content-Length: 154
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< Connection: keep-alive
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< Server: APISIX/2.0
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< X-APISIX-Upstream-Status: 502
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<
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<html>
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<head><title>502 Bad Gateway</title></head>
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<body>
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<center><h1>502 Bad Gateway</h1></center>
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<hr><center>openresty</center>
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</body>
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</html>
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```
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It has a response header of `X-APISIX-Upstream-Status: 502`.
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>Example 2: `502` response status code comes from `APISIX`
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```shell
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$ curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"plugins": {
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"fault-injection": {
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"abort": {
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"http_status": 500,
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"body": "Fault Injection!\n"
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}
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}
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},
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"uri": "/hello"
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}'
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```
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Test：
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```shell
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$ curl http://127.0.0.1:9080/hello -v
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......
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< HTTP/1.1 500 Internal Server Error
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< Date: Wed, 25 Nov 2020 14:50:20 GMT
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< Content-Type: text/plain; charset=utf-8
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< Transfer-Encoding: chunked
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< Connection: keep-alive
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< Server: APISIX/2.0
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<
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Fault Injection!
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```
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There is no response header for `X-APISIX-Upstream-Status`.
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>Example 3: `Upstream` has multiple nodes, and all nodes are unavailable
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```shell
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$ curl http://127.0.0.1:9080/apisix/admin/upstreams/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"nodes": {
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"127.0.0.3:1": 1,
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"127.0.0.2:1": 1,
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"127.0.0.1:1": 1
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},
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"retries": 2,
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"type": "roundrobin"
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}'
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```
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```shell
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$ curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
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{
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"uri": "/hello",
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"upstream_id": "1"
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}'
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```
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Test：
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```shell
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$ curl http://127.0.0.1:9080/hello -v
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< HTTP/1.1 502 Bad Gateway
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< Date: Wed, 25 Nov 2020 15:07:34 GMT
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< Content-Type: text/html; charset=utf-8
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< Content-Length: 154
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< Connection: keep-alive
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< Server: APISIX/2.0
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< X-APISIX-Upstream-Status: 502, 502, 502
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<
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<html>
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<head><title>502 Bad Gateway</title></head>
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<body>
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<center><h1>502 Bad Gateway</h1></center>
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<hr><center>openresty</center>
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</body>
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</html>
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```
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It has a response header of `X-APISIX-Upstream-Status: 502, 502, 502`.
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