Apache HttpClient执行是否将对所有HTTP 5XX错误抛出IOException? [英] Will Apache HttpClient execute throw an IOException on ALL HTTP 5XX errors?

问题描述

服务器5xx错误?

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

我问的原因是，在此逻辑下，我们正在执行以下操作:

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

解决方案

否， HttpClient 不会为任何 500/5xx响应抛出IOException .

当低级连接失败(例如，无效的主机名，没有服务器监听)或TCP管道异常断开(例如，互联网连接丢失)时，IOException只会发生. >

"HTTP 500"是服务器响应，即 valid 服务器响应，用于指示错误情况.它具有状态码，标头和正文，这是200个响应所具有的全部内容.

文档说返回值是"对请求的[最终]响应"；只要服务器能够返回 a 有效响应，就不管状态码如何都是如此.

The Apache HttpClient docs for the execute(HttpHost target, HttpRequest request) method says:

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

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
}

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?
}

解决方案

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

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).

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.

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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