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package org.apache.http.impl.client;

import java.io.IOException;
import java.net.URI;

import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.HttpResponse;
import org.apache.http.HttpResponseInterceptor;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.client.protocol.RequestAcceptEncoding;
import org.apache.http.client.protocol.ResponseContentEncoding;
import org.apache.http.client.utils.URIUtils;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;

/**
 * 

Decorator adding support for compressed responses. This class sets * the {@code Accept-Encoding} header on requests to indicate * support for the {@code gzip} and {@code deflate} * compression schemes; it then checks the {@code Content-Encoding} * header on the response to uncompress any compressed response bodies. * The {@link java.io.InputStream} of the entity will contain the uncompressed * content.

* *

N.B. Any upstream clients of this class need to be aware that * this effectively obscures visibility into the length of a server * response body, since the {@code Content-Length} header will * correspond to the compressed entity length received from the server, * but the content length experienced by reading the response body may * be different (hopefully higher!).

* *

That said, this decorator is compatible with the * {@code CachingHttpClient} in that the two decorators can be added * in either order and still have cacheable responses be cached.

* * @since 4.2 * * @deprecated (4.3) use {@link HttpClientBuilder} */ @Deprecated public class DecompressingHttpClient implements HttpClient { private final HttpClient backend; private final HttpRequestInterceptor acceptEncodingInterceptor; private final HttpResponseInterceptor contentEncodingInterceptor; /** * Constructs a decorator to ask for and handle compressed * entities on the fly. */ public DecompressingHttpClient() { this(new DefaultHttpClient()); } /** * Constructs a decorator to ask for and handle compressed * entities on the fly. * @param backend the {@link HttpClient} to use for actually * issuing requests */ public DecompressingHttpClient(final HttpClient backend) { this(backend, new RequestAcceptEncoding(), new ResponseContentEncoding()); } DecompressingHttpClient(final HttpClient backend, final HttpRequestInterceptor requestInterceptor, final HttpResponseInterceptor responseInterceptor) { this.backend = backend; this.acceptEncodingInterceptor = requestInterceptor; this.contentEncodingInterceptor = responseInterceptor; } @Override public HttpParams getParams() { return backend.getParams(); } @Override public ClientConnectionManager getConnectionManager() { return backend.getConnectionManager(); } @Override public HttpResponse execute(final HttpUriRequest request) throws IOException, ClientProtocolException { return execute(getHttpHost(request), request, (HttpContext)null); } /** * Gets the HttpClient to issue request. * * @return the HttpClient to issue request */ public HttpClient getHttpClient() { return this.backend; } HttpHost getHttpHost(final HttpUriRequest request) { final URI uri = request.getURI(); return URIUtils.extractHost(uri); } @Override public HttpResponse execute(final HttpUriRequest request, final HttpContext context) throws IOException, ClientProtocolException { return execute(getHttpHost(request), request, context); } @Override public HttpResponse execute(final HttpHost target, final HttpRequest request) throws IOException, ClientProtocolException { return execute(target, request, (HttpContext)null); } @Override public HttpResponse execute(final HttpHost target, final HttpRequest request, final HttpContext context) throws IOException, ClientProtocolException { try { final HttpContext localContext = context != null ? context : new BasicHttpContext(); final HttpRequest wrapped; if (request instanceof HttpEntityEnclosingRequest) { wrapped = new EntityEnclosingRequestWrapper((HttpEntityEnclosingRequest) request); } else { wrapped = new RequestWrapper(request); } acceptEncodingInterceptor.process(wrapped, localContext); final HttpResponse response = backend.execute(target, wrapped, localContext); try { contentEncodingInterceptor.process(response, localContext); if (Boolean.TRUE.equals(localContext.getAttribute(ResponseContentEncoding.UNCOMPRESSED))) { response.removeHeaders("Content-Length"); response.removeHeaders("Content-Encoding"); response.removeHeaders("Content-MD5"); } return response; } catch (final HttpException ex) { EntityUtils.consume(response.getEntity()); throw ex; } catch (final IOException ex) { EntityUtils.consume(response.getEntity()); throw ex; } catch (final RuntimeException ex) { EntityUtils.consume(response.getEntity()); throw ex; } } catch (final HttpException e) { throw new ClientProtocolException(e); } } @Override public T execute(final HttpUriRequest request, final ResponseHandler responseHandler) throws IOException, ClientProtocolException { return execute(getHttpHost(request), request, responseHandler); } @Override public T execute(final HttpUriRequest request, final ResponseHandler responseHandler, final HttpContext context) throws IOException, ClientProtocolException { return execute(getHttpHost(request), request, responseHandler, context); } @Override public T execute(final HttpHost target, final HttpRequest request, final ResponseHandler responseHandler) throws IOException, ClientProtocolException { return execute(target, request, responseHandler, null); } @Override public T execute(final HttpHost target, final HttpRequest request, final ResponseHandler responseHandler, final HttpContext context) throws IOException, ClientProtocolException { final HttpResponse response = execute(target, request, context); try { return responseHandler.handleResponse(response); } finally { final HttpEntity entity = response.getEntity(); if (entity != null) { EntityUtils.consume(entity); } } } }




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