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add a blog post on commons-httpclient
author Dirk Olmes <dirk@xanthippe.ping.de>
date Thu, 03 Oct 2013 04:43:06 +0200
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1 Title: Apache commons-httpclient vs. self signed certificates
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2 Date: 2013-10-03
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3 Tags: httpclient
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4 Lang: en
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6 Recently I tried to retrieve HTML pages from a host that was using self signed HTTPS certificates. I used the excellent [Apache commons httpclient](http://hc.apache.org/httpcomponents-client-4.2.x/index.html) for the job. Their [tutorial](http://hc.apache.org/httpcomponents-client-4.2.x/tutorial/html/) is quite extensive and even gives examples about some customizations that can be made in the context of SSL. But being a good open source documentation, the tutorial only tells you the tiny details of tweaking individual settings, leaving the big picture for you to figure out.
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8 So how does all the talk about socket factories and SSLContext and friends go together with your [HttpClient](http://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache/http/client/HttpClient.html)?
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10 Let's assume you already have a HttpClient instance at hand:
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12 HttpClient client = new DefaultHttpClient();
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14 Now let's configure all the socket factories and stuff that's required to make HTTPS traffic with self signed certificates work:
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16 TrustStrategy trustStrategy = new TrustSelfSignedStrategy();
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17 X509HostnameVerifier hostnameVerifier = SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER;
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18 SchemeSocketFactory socketFactory = new SSLSocketFactory(trustStrategy, hostnameVerifier);
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20 And now let's put it all together:
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22 Scheme https = new Scheme("https", 443, socketFactory);
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23 SchemeRegistry registry = client.getConnectionManager().getSchemeRegistry();
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24 registry.register(https);