Common HTTPclient and proxy

Question

I am using apache s common httpclient library  Is it possible to make HTTP request over proxy  More specific  I need to use proxy list for multithreaded POST requests  right now I am testing with single threaded GET requests    I tried to use           httpclient getHostConfiguration   setProxy  67 177 104 230   58720     I get errors with that code   21 03 2012  20 49 17 org apache commons httpclient HttpMethodDirector executeWithRetry INFO  I O exception  java net ConnectException  caught when processing request  Connection refused  connect 21 03 2012  20 49 17 org apache commons httpclient HttpMethodDirector executeWithRetry INFO  Retrying request 21 03 2012  20 49 19 org apache commons httpclient HttpMethodDirector executeWithRetry INFO  I O exception  java net ConnectException  caught when processing request  Connection refused  connect 21 03 2012  20 49 19 org apache commons httpclient HttpMethodDirector executeWithRetry INFO  Retrying request 21 03 2012  20 49 21 org apache commons httpclient HttpMethodDirector executeWithRetry INFO  I O exception  java net ConnectException  caught when processing request  Connection refused  connect 21 03 2012  20 49 21 org apache commons httpclient HttpMethodDirector executeWithRetry INFO  Retrying request org apache commons httpclient ProtocolException  The server xxxxx failed to respond with a valid HTTP response     at org apache commons httpclient HttpMethodBase readStatusLine HttpMethodBase java 1846      at org apache commons httpclient HttpMethodBase readResponse HttpMethodBase java 1590      at org apache commons httpclient HttpMethodBase execute HttpMethodBase java 995      at org apache commons httpclient ConnectMethod execute ConnectMethod java 144      at org apache commons httpclient HttpMethodDirector executeConnect HttpMethodDirector java 495      at org apache commons httpclient HttpMethodDirector executeWithRetry HttpMethodDirector java 390      at org apache commons httpclient HttpMethodDirector executeMethod HttpMethodDirector java 170      at org apache commons httpclient HttpClient executeMethod HttpClient java 396      at org apache commons httpclient HttpClient executeMethod HttpClient java 324      at test main test java 42    When I remove that line  everything runs fine as expected

User · Answer

Although this question is very old  but I see still there are no exact answer  I will try to answer the question here    I believe the question in short here is how to set the proxy settings for the Apache commons HttpClient  org apache commons httpclient HttpClient     Code snippet below should work    HttpClient client   new HttpClient    HostConfiguration hostConfiguration   client getHostConfiguration    hostConfiguration setProxy  localhost   8080   client setHostConfiguration hostConfiguration

User · Answer

Starting from Apache HTTPComponents 4 3 x HttpClientBuilder class sets the proxy defaults from System properties http proxyHost and http proxyPort or else you can override them using setProxy method

User · Answer

For httpclient 4 1 x you can set the proxy like this  taken from this example        HttpHost proxy   new HttpHost  127 0 0 1   8080   http         DefaultHttpClient httpclient   new DefaultHttpClient        try           httpclient getParams   setParameter ConnRoutePNames DEFAULT PROXY  proxy            HttpHost target   new HttpHost  issues apache org   443   https            HttpGet req   new HttpGet                System out println  executing request to     target     via     proxy           HttpResponse rsp   httpclient execute target  req                     finally              When HttpClient instance is no longer needed             shut down the connection manager to ensure            immediate deallocation of all system resources         httpclient getConnectionManager   shutdown

User · Answer

I had a similar problem with HttpClient version 4   I couldn t connect to the server because of a SOCKS proxy error and I fixed it using the below configuration   client getParams   setParameter  socksProxyHost  proxyHost   client getParams   setParameter  socksProxyPort  proxyPort

User · Answer

Here is how I solved this problem for the old   lt  4 3  HttpClient  which I cannot upgrade   using the answer of Santosh Singh  who I gave a  1    HttpClient httpclient   new HttpClient    if  System getProperty  http proxyHost      null      try       HostConfiguration hostConfiguration   httpclient getHostConfiguration        hostConfiguration setProxy System getProperty  http proxyHost    Integer parseInt System getProperty  http proxyPort          httpclient setHostConfiguration hostConfiguration       this getLogger   warn  USING PROXY    httpclient getHostConfiguration   getProxyHost         catch  Exception e        throw new ProcessingException  Cannot set proxy    e

User · Answer

Here is how to do that with the last version of HTTPClient  4 3 4       CloseableHttpClient httpclient   HttpClients createDefault        try           HttpHost target   new HttpHost  localhost   443   https            HttpHost proxy   new HttpHost  127 0 0 1   8080   http             RequestConfig config   RequestConfig custom                    setProxy proxy                   build            HttpGet request   new HttpGet               request setConfig config            System out println  Executing request     request getRequestLine       to     target     via     proxy            CloseableHttpResponse response   httpclient execute target  request           try               System out println  ----------------------------------------                System out println response getStatusLine                 EntityUtils consume response getEntity               finally               response close                    finally           httpclient close

User · Answer

If your software uses a ProxySelector  for example for using a PAC-script instead of a static host port  and your HTTPComponents is version 4 3 or above then you can use your ProxySelector for your HttpClient like this   ProxySelector myProxySelector        HttpClient myHttpClient   HttpClientBuilder create   setRoutePlanner new SystemDefaultRoutePlanner myProxySelector    build      And then do your requests as usual   HttpGet myRequest   new HttpGet       myHttpClient execute myRequest

[java] Common HTTPclient and proxy

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