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Java example source code file (HttpOptions.java)

This example source code file (HttpOptions.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

allow, hashset, headerelement, headeriterator, httpoptions, httprequestbase, httpresponse, illegalargumentexception, method_name, net, network, notthreadsafe, override, set, string, uri, util

The HttpOptions.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.methods;

import java.net.URI;
import java.util.HashSet;
import java.util.Set;

import org.apache.http.annotation.NotThreadSafe;

import org.apache.http.Header;
import org.apache.http.HeaderElement;
import org.apache.http.HeaderIterator;
import org.apache.http.HttpResponse;

 * HTTP OPTIONS method.
 * <p>
 * The HTTP OPTIONS method is defined in section 9.2 of 
 * <a href="http://www.ietf.org/rfc/rfc2616.txt">RFC2616:
 * <blockquote>
 *  The OPTIONS method represents a request for information about the
 *  communication options available on the request/response chain
 *  identified by the Request-URI. This method allows the client to
 *  determine the options and/or requirements associated with a resource,
 *  or the capabilities of a server, without implying a resource action
 *  or initiating a resource retrieval.
 * </blockquote>
 * </p>
 * @since 4.0
public class HttpOptions extends HttpRequestBase {

    public final static String METHOD_NAME = "OPTIONS";
    public HttpOptions() {

    public HttpOptions(final URI uri) {

     * @throws IllegalArgumentException if the uri is invalid. 
    public HttpOptions(final String uri) {

    public String getMethod() {
        return METHOD_NAME;
    public Set<String> getAllowedMethods(final HttpResponse response) {
        if (response == null) {
            throw new IllegalArgumentException("HTTP response may not be null");
        HeaderIterator it = response.headerIterator("Allow");
        Set<String> methods = new HashSet();
        while (it.hasNext()) {
            Header header = it.nextHeader();
            HeaderElement[] elements = header.getElements();
            for (HeaderElement element : elements) {
        return methods;

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