java - Apache HttpClient : how to send headers along with CONNECT request

Question

我需要连接到读取 CONNECT 请求中 header 的代理。我特指的是在切换到 HTTPS 加密流之前与 CONNECT 一起传递的 header 。

这可以用 HttpClient 实现吗？它的默认行为似乎是通过加密流推送所有 header 。

Answer 1

我不确定您应该这样做(我个人没有看到向 CONNECT 请求添加自定义 header 的有效理由)，但这就是使用 HttpClient 4.3 或更高版本来完成此操作的方法

class MyHttpClientBuilder extends HttpClientBuilder {

    @Override
    protected ClientExecChain createMainExec(
            final HttpRequestExecutor requestExec,
            final HttpClientConnectionManager connManager,
            final ConnectionReuseStrategy reuseStrategy,
            final ConnectionKeepAliveStrategy keepAliveStrategy,
            final HttpProcessor proxyHttpProcessor,
            final AuthenticationStrategy targetAuthStrategy,
            final AuthenticationStrategy proxyAuthStrategy,
            final UserTokenHandler userTokenHandler) {

        final HttpProcessor myProxyHttpProcessor = new ImmutableHttpProcessor(new RequestTargetHost(), new HttpRequestInterceptor() {
            @Override
            public void process(HttpRequest request, HttpContext context) throws HttpException, IOException {
                request.addHeader("Hello", "Mom says hi");
            }
        });

        return super.createMainExec(requestExec, connManager, reuseStrategy, keepAliveStrategy,
                myProxyHttpProcessor, targetAuthStrategy, proxyAuthStrategy, userTokenHandler);
    }
}

HttpClientBuilder httpClientBuilder = new MyHttpClientBuilder();
CloseableHttpClient client = MyHttpClientBuilder.build();