2021-02-26 21:40:08 +08:00
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---
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title: 调试功能
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---
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2020-11-27 18:33:02 +08:00
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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` 响应状态码
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500、502、503等类似的 `5xx` 状态码，是由于服务器错误而响应的状态码，当一个请求出现 `5xx` 状态码时；它可能来源于 `APISIX` 或 `Upstream` 。如何识别这些响应状态码的来源，是一件很有意义的事，它能够快速的帮助我们确定问题的所在。
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## 如何识别 `5xx` 响应状态码的来源
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在请求的响应头中，通过 `X-APISIX-Upstream-Status` 这个响应头，我们可以有效的识别 `5xx` 状态码的来源。当 `5xx` 状态码来源于 `Upstream` 时，在响应头中可以看到 `X-APISIX-Upstream-Status` 这个响应头，并且这个响应头的值为响应的状态码。当 `5xx` 状态码来源于 `APISIX` 时，响应头中没有 `X-APISIX-Upstream-Status` 的响应头信息。也就是只有 `5xx` 状态码来源于 `Upstream` 时，才会有 `X-APISIX-Upstream-Status` 响应头。
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## 示例
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示例1：`502` 响应状态码来源于 `Upstream` (IP地址不可用)
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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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测试：
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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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具有 `X-APISIX-Upstream-Status: 502` 的响应头。
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示例2: `502` 响应状态码来源于 `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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测试：
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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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没有 `X-APISIX-Upstream-Status` 的响应头。
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示例3：`Upstream` 具有多节点，并且所有节点不可用
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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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测试：
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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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具有 `X-APISIX-Upstream-Status: 502, 502, 502` 的响应头。
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