How to set proxy host on HttpClient request in Java

Question

I want to set proxy before sending HttpClient request on a URL. As I am able to connect it curl command setting up the proxy but with Java code I am not able to

Answer 1

Add maven dependency (4.2.X+):

    org.apache.httpcomponents
    httpclient
    4.5.3
    
        
            commons-logging
            commons-logging
        
    

Use HttpClientBuilder and set flag useSystemProperties:

HttpClient client = HttpClientBuilder.create().useSystemProperties().build();

then you have two options at least:

Option A: Override arguments, i.e.

java -Djava.net.useSystemProxies=true 
     -Dhttp.proxyHost=PROXY_HOST
     -Dhttp.proxyPort=PROXY_PORT 
     -Dhttp.proxyUser=USERNAME
     -Dhttp.proxyPassword=PASSWORD
     -jar your-app.jar

Option B: Set up JVM (${JAVA_HOME}/lib/net.properties):

java.net.useSystemProxies=true
http.proxyHost=some-host
http.proxyPort=some-port

and run your application