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Java example source code file (RequestProxyAuthentication.java)

This example source code file (RequestProxyAuthentication.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java tags/keywords

authenticationexception, authscheme, authstate, credentials, http, httpcontext, httpexception, httprequestinterceptor, illegalargumentexception, immutable, io, ioexception, log, requestproxyauthentication, user

The RequestProxyAuthentication.java example source code

 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *   http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.

package org.apache.http.client.protocol;

import java.io.IOException;

import org.apache.http.annotation.Immutable;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.auth.AUTH;
import org.apache.http.auth.AuthScheme;
import org.apache.http.auth.AuthState;
import org.apache.http.auth.AuthenticationException;
import org.apache.http.auth.Credentials;
import org.apache.http.protocol.HttpContext;

 * Generates authentication header for the proxy host, if required, 
 * based on the actual state of the HTTP authentication context.   
 * @since 4.0
public class RequestProxyAuthentication implements HttpRequestInterceptor {

    private final Log log = LogFactory.getLog(getClass());
    public RequestProxyAuthentication() {
    public void process(final HttpRequest request, final HttpContext context) 
            throws HttpException, IOException {
        if (request == null) {
            throw new IllegalArgumentException("HTTP request may not be null");
        if (context == null) {
            throw new IllegalArgumentException("HTTP context may not be null");

        if (request.containsHeader(AUTH.PROXY_AUTH_RESP)) {
        // Obtain authentication state
        AuthState authState = (AuthState) context.getAttribute(
        if (authState == null) {

        AuthScheme authScheme = authState.getAuthScheme();
        if (authScheme == null) {
        Credentials creds = authState.getCredentials();
        if (creds == null) {
            this.log.debug("User credentials not available");
        if (authState.getAuthScope() != null || !authScheme.isConnectionBased()) {
            try {
                request.addHeader(authScheme.authenticate(creds, request));
            } catch (AuthenticationException ex) {
                if (this.log.isErrorEnabled()) {
                    this.log.error("Proxy authentication error: " + ex.getMessage());

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