Apache httpclient and SSL proxy

Defonds 2020-11-13 04:49:34
apache httpclient ssl proxy

There's a scene like this , For safety reasons , Some clients operating on sensitive data have to go through VPN Access server . This kind of client is called proxy access . Routing diagram :

HTTPS Client <------- Encrypted CONNECT Requests -------> HTTPS Proxy <------- Encrypted CONNECT Requests -------> HTTPS End-Site

Proxy address and port number as Property Parameter injection jvm process :https.proxyHosthttps.proxyPort.

And most clients don't need VPN Access server , Just go through HTTPS Just visit directly . This kind of client is called direct access . Routing diagram :

HTTPS Client <------- Encrypted CONNECT Requests -------> HTTPS End-Site
Be careful :
  • The agent is configured to global Way to provide , That is to say, the server is the same , All distributed clients start with the above Property Parameters
  • such VPN Agent with LB The difference between agents is that proxy No configuration required SSL certificate , in other words VPN Only responsible for monitoring and forwarding services

Solution 1: Use JVM Original ecology java.net and javax.net.ssl tool kit

Schematic code :

 URL localURL = new URL(urlPath);
URLConnection connection = localURL.openConnection();
HttpURLConnection httpURLConnection = (HttpURLConnection) connection;
if (connection instanceof HttpsURLConnection) {

TrustManager[] tm = {
try {

SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
sslContext.init(null, tm, new java.security.SecureRandom());
SSLSocketFactory ssf = sslContext.getSocketFactory();
((HttpsURLConnection) httpURLConnection).setSSLSocketFactory(ssf);
((HttpsURLConnection) httpURLConnection).setHostnameVerifier(ignoreHostnameVerifier);
} catch (NoSuchAlgorithmException e1) {

logger.logError(e1.getMessage(), e1);
} catch (NoSuchProviderException e1) {

logger.logError(e1.getMessage(), e1);
} catch (KeyManagementException e1) {

logger.logError(e1.getMessage(), e1);
httpURLConnection.setRequestProperty("Content-Type", "application/octet-stream");
httpURLConnection.setRequestProperty("Accept-Encoding", "chunck");
outputStream = httpURLConnection.getOutputStream();

advantage :

  • It can automatically identify https.proxyHosthttps.proxyPort etc. Property
  • It can automatically identify the direct connection 、 Proxy access environment , Then decide whether to use in-process Property Hang proxy access

shortcoming :

  • Single access performance is worse than Apache HttpClient tool kit , Performance minus one
  • Poor connection pooling management , Performance minus one more

All in all , Play or exchange learning can , It's too much for a production environment .

Solution 2: Use Apache HttpClient Toolkit's RequestConfig

Schematic code :

 HttpHost target = new HttpHost("defonds.net", 443, "https");
HttpHost proxy = new HttpHost("", 7443, "https");
RequestConfig config = RequestConfig.custom()
HttpGet request = new HttpGet("/");
CloseableHttpResponse response = httpclient.execute(target, request);

Reference from Apache Official sample code :https://hc.apache.org/httpcomponents-client-ga/httpclient/examples/org/apache/http/examples/client/ClientExecuteProxy.java.
A direct connection environment can , The agent environment stops cooking . There are similar to the following SSL Handshake problem :

{tls}->>https://defonds.net:443 Connection reset java.net.SocketException: Connection reset at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1367)

Solution 3: Use Apache HttpClient Toolkit's HttpRoutePlanner

Schematic code :

HttpRoutePlanner routePlanner = new HttpRoutePlanner() {

public HttpRoute determineRoute(
HttpHost target,
HttpRequest request,
HttpContext context) throws HttpException {

return new HttpRoute(target, null, new HttpHost("someproxy", 8080),
CloseableHttpClient httpclient = HttpClients.custom()

Reference from Apache Official sample code :http://hc.apache.org/httpcomponents-client-4.5.x/tutorial/html/connmgmt.html#d5e485.
The above code in the proxy environment can , The direct connection environment also needs to adapt itself .
advantage :

  • The bottom layer has done transmission optimization , The single performance is better than the original ecological toolkit
  • Pool management is efficient and high performance

shortcoming :

  • Can't automatically recognize https.proxyHosthttps.proxyPort etc. Property
  • agent / Direct connection needs explicit adaptation

Reference material


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