问题描述
我正在尝试测试服务器，以查看其是否符合以下定义，为此，我需要从上游服务器构造无效的响应并将其发送到网关服务器. HTTP规范对状态码502-错误的网关进行了以下说明.
I'm trying to test a server to see if it behaves according to the definition below and for that, I need to construct and send an invalid response to the gateway server, from the upstream server. The HTTP spec says the following regarding the status code 502 - Bad Gateway.
但是什么才是无效响应呢?非标准响应代码(例如，一些随机数，例如6789)是否算作无效响应?还是HTTP版本无效的响应?
But what exactly constitute an invalid response? Does a non-standard response code (say, some random number like 6789) count as an invalid response? Or a response with an invalid HTTP version?
请输入以下内容: 502 HTTP状态代码，其中指出不完整的标头和响应主体可以导致502错误.服务器如何确定标头或正文不完整?更重要的是，是否可以通过编程方式创建这样的响应(我正在使用Java)?
Came across this: 502 HTTP Status Code, which says incomplete headers and response bodies can cause 502 errors. How does a server determine if the headers or the body is incomplete? And more importantly, is it possible to create such a response programmatically (I'm using Java)?
推荐答案
我设法在HTTP规范(RFC7230第3.3.3节)中找到了以下内容.
I managed to find the following in the HTTP spec (RFC7230 section 3.3.3).
除此之外，我还注意到，当上游服务器关闭时，Nginx在充当反向代理/负载平衡器时返回502.
Apart from this, I've also noticed that Nginx returns a 502 when acting as a reverse proxy/load balancer, when the upstream server is down.
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