Apache HttpClient：如何发送 headers 连同 CONNECT 请求

Question

我需要连接到在 CONNECT 请求中读取 headers 的代理。我的意思是在切换到 en HTTPS-encrypted 流之前，与 CONNECT 一起传递的 headers。

HttpClient 可以吗？它的默认行为似乎是通过加密流推送所有 headers。

Answer 1

我不确定你是否应该这样做（我个人看不到向 CONNECT 请求添加自定义 headers 的正当理由）但这是使用 HttpClient 4.3 或更新版本可以做到的

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();