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A very lightweight WebSocket client library for Java/Android which aims to implement the WebSocket protocol as defined in RFC 6455
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/*
 * ====================================================================
 * 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
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * 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
 * .
 *
 */

package tech.gusavila92.apache.http.protocol;

import java.io.IOException;

import tech.gusavila92.apache.http.Header;
import tech.gusavila92.apache.http.HttpEntity;
import tech.gusavila92.apache.http.HttpException;
import tech.gusavila92.apache.http.HttpRequest;
import tech.gusavila92.apache.http.HttpResponse;
import tech.gusavila92.apache.http.HttpResponseInterceptor;
import tech.gusavila92.apache.http.HttpStatus;
import tech.gusavila92.apache.http.HttpVersion;
import tech.gusavila92.apache.http.ProtocolVersion;
import tech.gusavila92.apache.http.annotation.ThreadingBehavior;
import tech.gusavila92.apache.http.annotation.Contract;
import tech.gusavila92.apache.http.util.Args;

/**
 * ResponseConnControl is responsible for adding {@code Connection} header
 * to the outgoing responses, which is essential for managing persistence of
 * {@code HTTP/1.0} connections. This interceptor is recommended for
 * server side protocol processors.
 *
 * @since 4.0
 */
@Contract(threading = ThreadingBehavior.IMMUTABLE)
public class ResponseConnControl implements HttpResponseInterceptor {

    public ResponseConnControl() {
        super();
    }

    @Override
    public void process(final HttpResponse response, final HttpContext context)
            throws HttpException, IOException {
        Args.notNull(response, "HTTP response");

        final HttpCoreContext corecontext = HttpCoreContext.adapt(context);

        // Always drop connection after certain type of responses
        final int status = response.getStatusLine().getStatusCode();
        if (status == HttpStatus.SC_BAD_REQUEST ||
                status == HttpStatus.SC_REQUEST_TIMEOUT ||
                status == HttpStatus.SC_LENGTH_REQUIRED ||
                status == HttpStatus.SC_REQUEST_TOO_LONG ||
                status == HttpStatus.SC_REQUEST_URI_TOO_LONG ||
                status == HttpStatus.SC_SERVICE_UNAVAILABLE ||
                status == HttpStatus.SC_NOT_IMPLEMENTED) {
            response.setHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE);
            return;
        }
        final Header explicit = response.getFirstHeader(HTTP.CONN_DIRECTIVE);
        if (explicit != null && HTTP.CONN_CLOSE.equalsIgnoreCase(explicit.getValue())) {
            // Connection persistence explicitly disabled
            return;
        }
        // Always drop connection for HTTP/1.0 responses and below
        // if the content body cannot be correctly delimited
        final HttpEntity entity = response.getEntity();
        if (entity != null) {
            final ProtocolVersion ver = response.getStatusLine().getProtocolVersion();
            if (entity.getContentLength() < 0 &&
                    (!entity.isChunked() || ver.lessEquals(HttpVersion.HTTP_1_0))) {
                response.setHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE);
                return;
            }
        }
        // Drop connection if requested by the client or request was <= 1.0
        final HttpRequest request = corecontext.getRequest();
        if (request != null) {
            final Header header = request.getFirstHeader(HTTP.CONN_DIRECTIVE);
            if (header != null) {
                response.setHeader(HTTP.CONN_DIRECTIVE, header.getValue());
            } else if (request.getProtocolVersion().lessEquals(HttpVersion.HTTP_1_0)) {
                response.setHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE);
            }
        }
    }

}