Apache HttpClient 执行会在所有 HTTP 5XX 错误上抛出 IOException 吗? [英] Will Apache HttpClient execute throw an IOException on ALL HTTP 5XX errors?

问题描述

Apache HttpClient 文档 用于 execute(HttpHost target, HttpRequest request) 方法说:

IOException - 如果出现问题或连接中止

IOException - in case of a problem or the connection was aborted

如果我捕获 IOException，这会捕获 ALL 服务器 5xx 错误?

If I catch the IOException, will this catch ALL Server 5xx Errors?

try {
  response = client.execute(httpHost, request);
} catch (IOException e) {
  // throw custom Exception
} finally {
  // close response and client
}

我问的原因是，在这个逻辑之后的其他地方，我们正在做如下事情:

The reason I'm asking is that after this logic somewhere else down the line we're doing something like the following:

if (response.getStatusLine().getStatusCode() >= 500) {
  // Could we ever reach this point after the code above?
}

推荐答案

不，HttpClient 不会抛出一个 IOException for any 500/5xx 响应强>.

No, HttpClient will not throw an IOException for any 500/5xx response.

IOException仅在低级连接失败(例如无效的主机名、没有服务器侦听)或 TCP 管道异常断开(例如互联网连接丢失)时发生.

An IOException occurs only when the low-level connection failed (eg. invalid hostname, no server listening) or the TCP pipe was abnormally broken (eg. internet connection was lost).

HTTP 500"是服务器响应 - 有效 服务器响应 - 用于指示错误情况.它有一个状态代码、标题和正文，这是 200 响应所具有的一切.

An 'HTTP 500' is a server response - a valid server response - to indicate an error condition. It has a status code, headers, and body, which is everything a 200 response has.

文档说返回值是对请求的[最终]响应"；只要服务器能够返回一个有效响应，无论状态代码如何，这都是正确的.

The documentation says the return value is "the [final] response to the request"; this is true regardless of the status code as long as the server was able to return a valid response.

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