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我们有一个 API 服务器并且正在使用 HTTP 负载均衡器。我们发现如果 HTTP 请求的数据很大，L7 负载均衡器会返回 502 错误。

我们已经确认它在没有负载均衡器的情况下访问 API 时有效（直接访问 API Server。）

这个问题可能是一个类似的问题。HTTP 负载均衡器删除了大型请求正文的一部分

有人说使用 L4 Network Load Balancer 是一种可能的解决方案，但由于某些原因，例如基于 URL 的负载均衡和跨区域负载均衡，我们不想使用它。

// Response OK (data size is 1024)
curl -H "Content-Type: application/json" -X POST -d '{"xx": "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"}' https://xxxxxxxxxxxxxxx.com/xx/xxxxxxxxxxxx/xxxxxxxxx

// Response NG (data size is 1025)
curl -H "Content-Type: application/json" -X POST -d '{"xx": "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"}' https://xxxxxxxxxxxxxxx.com/xx/xxxxxxxxxxxx/xxxxxxxxx

似乎LB对post数据的大小有一些限制。测试显示限制为 1024 字节左右。

更新1

@chaintng救了我。链接帖子上的某人说，如果帖子数据超过 1024 字节，则curl添加。"Expect: 100-continue Header"

// Response NG (data size is 1025. without "Expect: ")
curl -H "Content-Type: application/json" -X POST -d '{"xx": "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"}' https://xxxxxxxxxxxxxxx.com/xx/xxxxxxxxxxxx/xxxxxxxxx

// Response OK (data size is 1025. with "Expect: ")
curl -H "Expect: " -H "Content-Type: application/json" -X POST -d '{"xx": "00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"}' https://xxxxxxxxxxxxxxx.com/xx/xxxxxxxxxxxx/xxxxxxxxx
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1 回答 1

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从这个问题Curl 到 Google Compute load balancer 的参考得到错误 502

这是因为 CURL 在请求大型 POST 正文时具有默认值，将标头定义为Expect: 100-continue

Google L7 负载平衡不支持哪个（在本文档中说明https://cloud.google.com/compute/docs/load-balancing/http/）

您所要做的就是在执行 curl 之前通过设置标头来忽略此行为。

例如在 PHP 中 curl_setopt($ch, CURLOPT_HTTPHEADER, ['Expect:']);

于 2016-11-07T11:54:11.203 回答