如何在 Apache HttpClient 4.3+ 中设置默认 HttpHost 目标? [英] How does one set Default HttpHost Target in Apache HttpClient 4.3+?

问题描述

在 Apache HttpClient 4.2 中，可以创建一个 DefaultHttpClient 并设置一个主机，以便那些进行 execute 调用的人不必在输入请求 URI 中提供主机信息，即:

In Apache HttpClient 4.2 one could create a DefaultHttpClient and set a host such that those making an execute call would not have to provide the host information in the input request URI, i.e.:

HttpHost targetHost = new HttpHost(host, port, secure ? "https" : "http");      
DefaultHttpClient defaultHttp = new DefaultHttpClient(connectionManager);
defaultHttp.getParams().setParameter(ClientPNames.DEFAULT_HOST, targetHost);

我承认这个策略看起来很尴尬，我继承了这段代码:).我相信在 4.2 中有更好的方法来做到这一点.

I do admit this strategy appears very awkward, I inherited this code :). I'm sure there's an even better way to do this in 4.2.

我想升级到 4.3 并注意到 DefaultHttpClient 和 ClientPNames 现在都被弃用了，取而代之的是 HttpClientBuilder 和 RequestConfig 分别.但是我找不到这样的方法来定义带有 RequestConfig 的默认目标.

I'm looking to upgrade to 4.3 and noticed that DefaultHttpClient and ClientPNames are now both deprecated in favor of HttpClientBuilder and RequestConfig respectively. However I can find no such way to define a default target with RequestConfig.

Documentation for execute 确实引用了该输入目标参数可以接受空值，所以我确定还有一种方法可以促进这一点，但我正在努力解决这个问题:

Documentation for execute does reference that that input target parameter can accept null, so I'm sure there is still a way to facilitate this, but I'm struggling to figure this out:

target - 请求的目标主机.如果实现仍然可以确定路由，例如到默认目标或通过检查请求，则它们可以接受 null.

target - the target host for the request. Implementations may accept null if they can still determine a route, for example to a default target or by inspecting the request.

推荐答案

这应该可以解决问题

HttpRoutePlanner rp = new DefaultRoutePlanner(DefaultSchemePortResolver.INSTANCE) {

    @Override
    public HttpRoute determineRoute(
            final HttpHost host,
            final HttpRequest request,
            final HttpContext context) throws HttpException {
        HttpHost target = host != null ? host : new HttpHost("some.default.host");
        return super.determineRoute(target, request, context);
    }
};

CloseableHttpClient client = HttpClients.custom()
        .setRoutePlanner(rp)
        .build();

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