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/*
* Copyright (C) 2013 Square, Inc.
*
* Licensed 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.
*/
package com.squareup.okhttp;
import com.squareup.okhttp.internal.http.OkHeaders;
import java.util.Collections;
import java.util.List;
import static com.squareup.okhttp.internal.http.StatusLine.HTTP_TEMP_REDIRECT;
import static java.net.HttpURLConnection.HTTP_MOVED_PERM;
import static java.net.HttpURLConnection.HTTP_MOVED_TEMP;
import static java.net.HttpURLConnection.HTTP_MULT_CHOICE;
import static java.net.HttpURLConnection.HTTP_PROXY_AUTH;
import static java.net.HttpURLConnection.HTTP_SEE_OTHER;
import static java.net.HttpURLConnection.HTTP_UNAUTHORIZED;
/**
* An HTTP response. Instances of this class are not immutable: the response
* body is a one-shot value that may be consumed only once. All other properties
* are immutable.
*/
public final class Response {
private final Request request;
private final Protocol protocol;
private final int code;
private final String message;
private final Handshake handshake;
private final Headers headers;
private final ResponseBody body;
private Response networkResponse;
private Response cacheResponse;
private final Response priorResponse;
private volatile CacheControl cacheControl; // Lazily initialized.
private Response(Builder builder) {
this.request = builder.request;
this.protocol = builder.protocol;
this.code = builder.code;
this.message = builder.message;
this.handshake = builder.handshake;
this.headers = builder.headers.build();
this.body = builder.body;
this.networkResponse = builder.networkResponse;
this.cacheResponse = builder.cacheResponse;
this.priorResponse = builder.priorResponse;
}
/**
* The wire-level request that initiated this HTTP response. This is not
* necessarily the same request issued by the application:
*
*
It may be transformed by the HTTP client. For example, the client
* may copy headers like {@code Content-Length} from the request body.
*
It may be the request generated in response to an HTTP redirect or
* authentication challenge. In this case the request URL may be
* different than the initial request URL.
*
*/
public Request request() {
return request;
}
/**
* Returns the HTTP protocol, such as {@link Protocol#HTTP_1_1} or {@link
* Protocol#HTTP_1_0}.
*/
public Protocol protocol() {
return protocol;
}
/** Returns the HTTP status code. */
public int code() {
return code;
}
/**
* Returns true if the code is in [200..300), which means the request was
* successfully received, understood, and accepted.
*/
public boolean isSuccessful() {
return code >= 200 && code < 300;
}
/** Returns the HTTP status message or null if it is unknown. */
public String message() {
return message;
}
/**
* Returns the TLS handshake of the connection that carried this response, or
* null if the response was received without TLS.
*/
public Handshake handshake() {
return handshake;
}
public List headers(String name) {
return headers.values(name);
}
public String header(String name) {
return header(name, null);
}
public String header(String name, String defaultValue) {
String result = headers.get(name);
return result != null ? result : defaultValue;
}
public Headers headers() {
return headers;
}
public ResponseBody body() {
return body;
}
public Builder newBuilder() {
return new Builder(this);
}
/** Returns true if this response redirects to another resource. */
public boolean isRedirect() {
switch (code) {
case HTTP_TEMP_REDIRECT:
case HTTP_MULT_CHOICE:
case HTTP_MOVED_PERM:
case HTTP_MOVED_TEMP:
case HTTP_SEE_OTHER:
return true;
default:
return false;
}
}
/**
* Returns the raw response received from the network. Will be null if this
* response didn't use the network, such as when the response is fully cached.
* The body of the returned response should not be read.
*/
public Response networkResponse() {
return networkResponse;
}
/**
* Returns the raw response received from the cache. Will be null if this
* response didn't use the cache. For conditional get requests the cache
* response and network response may both be non-null. The body of the
* returned response should not be read.
*/
public Response cacheResponse() {
return cacheResponse;
}
/**
* Returns the response for the HTTP redirect or authorization challenge that
* triggered this response, or null if this response wasn't triggered by an
* automatic retry. The body of the returned response should not be read
* because it has already been consumed by the redirecting client.
*/
public Response priorResponse() {
return priorResponse;
}
/**
* Returns the authorization challenges appropriate for this response's code.
* If the response code is 401 unauthorized, this returns the
* "WWW-Authenticate" challenges. If the response code is 407 proxy
* unauthorized, this returns the "Proxy-Authenticate" challenges. Otherwise
* this returns an empty list of challenges.
*/
public List challenges() {
String responseField;
if (code == HTTP_UNAUTHORIZED) {
responseField = "WWW-Authenticate";
} else if (code == HTTP_PROXY_AUTH) {
responseField = "Proxy-Authenticate";
} else {
return Collections.emptyList();
}
return OkHeaders.parseChallenges(headers(), responseField);
}
/**
* Returns the cache control directives for this response. This is never null,
* even if this response contains no {@code Cache-Control} header.
*/
public CacheControl cacheControl() {
CacheControl result = cacheControl;
return result != null ? result : (cacheControl = CacheControl.parse(headers));
}
@Override public String toString() {
return "Response{protocol="
+ protocol
+ ", code="
+ code
+ ", message="
+ message
+ ", url="
+ request.urlString()
+ '}';
}
public static class Builder {
private Request request;
private Protocol protocol;
private int code = -1;
private String message;
private Handshake handshake;
private Headers.Builder headers;
private ResponseBody body;
private Response networkResponse;
private Response cacheResponse;
private Response priorResponse;
public Builder() {
headers = new Headers.Builder();
}
private Builder(Response response) {
this.request = response.request;
this.protocol = response.protocol;
this.code = response.code;
this.message = response.message;
this.handshake = response.handshake;
this.headers = response.headers.newBuilder();
this.body = response.body;
this.networkResponse = response.networkResponse;
this.cacheResponse = response.cacheResponse;
this.priorResponse = response.priorResponse;
}
public Builder request(Request request) {
this.request = request;
return this;
}
public Builder protocol(Protocol protocol) {
this.protocol = protocol;
return this;
}
public Builder code(int code) {
this.code = code;
return this;
}
public Builder message(String message) {
this.message = message;
return this;
}
public Builder handshake(Handshake handshake) {
this.handshake = handshake;
return this;
}
/**
* Sets the header named {@code name} to {@code value}. If this request
* already has any headers with that name, they are all replaced.
*/
public Builder header(String name, String value) {
headers.set(name, value);
return this;
}
/**
* Adds a header with {@code name} and {@code value}. Prefer this method for
* multiply-valued headers like "Set-Cookie".
*/
public Builder addHeader(String name, String value) {
headers.add(name, value);
return this;
}
public Builder removeHeader(String name) {
headers.removeAll(name);
return this;
}
/** Removes all headers on this builder and adds {@code headers}. */
public Builder headers(Headers headers) {
this.headers = headers.newBuilder();
return this;
}
public Builder body(ResponseBody body) {
this.body = body;
return this;
}
public Builder networkResponse(Response networkResponse) {
if (networkResponse != null) checkSupportResponse("networkResponse", networkResponse);
this.networkResponse = networkResponse;
return this;
}
public Builder cacheResponse(Response cacheResponse) {
if (cacheResponse != null) checkSupportResponse("cacheResponse", cacheResponse);
this.cacheResponse = cacheResponse;
return this;
}
private void checkSupportResponse(String name, Response response) {
if (response.body != null) {
throw new IllegalArgumentException(name + ".body != null");
} else if (response.networkResponse != null) {
throw new IllegalArgumentException(name + ".networkResponse != null");
} else if (response.cacheResponse != null) {
throw new IllegalArgumentException(name + ".cacheResponse != null");
} else if (response.priorResponse != null) {
throw new IllegalArgumentException(name + ".priorResponse != null");
}
}
public Builder priorResponse(Response priorResponse) {
if (priorResponse != null) checkPriorResponse(priorResponse);
this.priorResponse = priorResponse;
return this;
}
private void checkPriorResponse(Response response) {
if (response.body != null) {
throw new IllegalArgumentException("priorResponse.body != null");
}
}
public Response build() {
if (request == null) throw new IllegalStateException("request == null");
if (protocol == null) throw new IllegalStateException("protocol == null");
if (code < 0) throw new IllegalStateException("code < 0: " + code);
return new Response(this);
}
}
}
