前言
上篇我们介绍了okhttp整体的流程执行，本篇来具体分析每个拦截器的执行，其中CacheInterceptor和ConnectInterceptor是里面的核心也是比较难的点。
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1.RetryAndFollowUpInterceptor，负责失败重连以及重定向
@Override public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
RealInterceptorChain realChain = (RealInterceptorChain) chain;
Call call = realChain.call();
EventListener eventListener = realChain.eventListener();
//1.StreamAllocation
StreamAllocation streamAllocation = new StreamAllocation(client.connectionPool(),
createAddress(request.url()), call, eventListener, callStackTrace);
this.streamAllocation = streamAllocation;
int followUpCount = 0;
Response priorResponse = null;
//2.开启无限循环
while (true) {
if (canceled) {
streamAllocation.release();
throw new IOException("Canceled");
}
Response response;
boolean releaseConnection = true;
try {
// 3.执行下一个拦截器，即BridgeInterceptor会将初始化好的连接对象传递给下一个拦截器
response = realChain.proceed(request, streamAllocation, null, null);
releaseConnection = false;
} catch (RouteException e) {
// The attempt to connect via a route failed. The request will not have been sent.
// 4.如果有异常，判断是否要恢复
if (!recover(e.getLastConnectException(), streamAllocation, false, request)) {
throw e.getLastConnectException();
}
releaseConnection = false;
continue;
} catch (IOException e) {
// An attempt to communicate with a server failed. The request may have been sent.
boolean requestSendStarted = !(e instanceof ConnectionShutdownException);
if (!recover(e, streamAllocation, requestSendStarted, request)) throw e;
releaseConnection = false;
continue;
} finally {
// We're throwing an unchecked exception. Release any resources.
if (releaseConnection) {
streamAllocation.streamFailed(null);
streamAllocation.release();
}
}
// 5.priorResponse 是否为null
if (priorResponse != null) {
response = response.newBuilder()
.priorResponse(priorResponse.newBuilder()
.body(null)
.build())
.build();
}
// 6.重定向
Request followUp = followUpRequest(response, streamAllocation.route());
if (followUp == null) {
if (!forWebSocket) {
streamAllocation.release();
}
return response;
}
closeQuietly(response.body());
if (++followUpCount > MAX_FOLLOW_UPS) {
streamAllocation.release();
throw new ProtocolException("Too many follow-up requests: " + followUpCount);
}
if (followUp.body() instanceof UnrepeatableRequestBody) {
streamAllocation.release();
throw new HttpRetryException("Cannot retry streamed HTTP body", response.code());
}
//7.检查是否有相同的链接，是：释放，重建创建
if (!sameConnection(response, followUp.url())) {
streamAllocation.release();
streamAllocation = new StreamAllocation(client.connectionPool(),
createAddress(followUp.url()), call, eventListener, callStackTrace);
this.streamAllocation = streamAllocation;
} else if (streamAllocation.codec() != null) {
throw new IllegalStateException("Closing the body of " + response
+ " didn't close its backing stream. Bad interceptor?");
}
request = followUp;
priorResponse = response;
}
}
- 1.注释1处创建了一个StreamAllocation对象，这个对象很重要在建立连接网络的时候使用的，这里只是初始化用于传入后面的拦截器使用的，后面会讲到，这里根据url创建一个Address对象，初始化一个Socket连接对象，基于Okio用于构造StreamAllocation对象。
- 2.开启了一个无限循环，如果取消streamAllocation释放再抛出异常
- 3.是把request和streamAllocation传给了下一个拦截器及BridgeInterceptor
- 4.如果有异常，判断是否要恢复
- 5.如果priorResponse不为空，则说明前面已经获取到了响应，这里会结合当前获取的Response和先前的Response
- 6.检查是否需要重定向，如果不需要重定向则返回当前请求，这里主要是根据响应码(code)和响应头(header)，查看是否需要重定向
- 7.检查是否有相同的链接，是就释放重建创建
-
2.BridgeInterceptor 负责对Request和Response处理
@Override public Response intercept(Chain chain) throws IOException {
Request userRequest = chain.request();
Request.Builder requestBuilder = userRequest.newBuilder();
//1。request
RequestBody body = userRequest.body();
if (body != null) {
MediaType contentType = body.contentType();
if (contentType != null) {
requestBuilder.header("Content-Type", contentType.toString());
}
long contentLength = body.contentLength();
if (contentLength != -1) {
requestBuilder.header("Content-Length", Long.toString(contentLength));
requestBuilder.removeHeader("Transfer-Encoding");
} else {
requestBuilder.header("Transfer-Encoding", "chunked");
requestBuilder.removeHeader("Content-Length");
}
}
if (userRequest.header("Host") == null) {
requestBuilder.header("Host", hostHeader(userRequest.url(), false));
}
if (userRequest.header("Connection") == null) {
requestBuilder.header("Connection", "Keep-Alive");
}
// If we add an "Accept-Encoding: gzip" header field we're responsible for also decompressing
// the transfer stream.
boolean transparentGzip = false;
if (userRequest.header("Accept-Encoding") == null && userRequest.header("Range") == null) {
transparentGzip = true;
requestBuilder.header("Accept-Encoding", "gzip");
}
List cookies = cookieJar.loadForRequest(userRequest.url());
if (!cookies.isEmpty()) {
requestBuilder.header("Cookie", cookieHeader(cookies));
}
if (userRequest.header("User-Agent") == null) {
requestBuilder.header("User-Agent", "3.10");
}
Response networkResponse = chain.proceed(requestBuilder.build());
HttpHeaders.receiveHeaders(cookieJar, userRequest.url(), networkResponse.headers());
Response.Builder responseBuilder = networkResponse.newBuilder()
.request(userRequest);
if (transparentGzip
&& "gzip".equalsIgnoreCase(networkResponse.header("Content-Encoding"))
&& HttpHeaders.hasBody(networkResponse)) {
GzipSource responseBody = new GzipSource(networkResponse.body().source());
Headers strippedHeaders = networkResponse.headers().newBuilder()
.removeAll("Content-Encoding")
.removeAll("Content-Length")
.build();
responseBuilder.headers(strippedHeaders);
String contentType = networkResponse.header("Content-Type");
responseBuilder.body(new RealResponseBody(contentType, -1L, Okio.buffer(responseBody)));
}
return responseBuilder.build();
}
- 这个拦截器比较简单主要负责request请求头的封装，cookie，gizp等，以及response响应的一些处理，就不再多说了。
-
3.CacheInterceptor负责对response缓存的一些处理
@Override public Response intercept(Chain chain) throws IOException {
//1.获取缓存的response
Response cacheCandidate = cache != null
? cache.get(chain.request())
: null;
long now = System.currentTimeMillis();
//2.缓存策略
CacheStrategy strategy = new CacheStrategy.Factory(now, chain.request(), cacheCandidate).get();
Request networkRequest = strategy.networkRequest;
Response cacheResponse = strategy.cacheResponse;
if (cache != null) {
cache.trackResponse(strategy);
}
if (cacheCandidate != null && cacheResponse == null) {
closeQuietly(cacheCandidate.body()); // The cache candidate wasn't applicable. Close it.
}
// 3.返回code=504
if (networkRequest == null && cacheResponse == null) {
return new Response.Builder()
.request(chain.request())
.protocol(Protocol.HTTP_1_1)
.code(504)
.message("Unsatisfiable Request (only-if-cached)")
.body(Util.EMPTY_RESPONSE)
.sentRequestAtMillis(-1L)
.receivedResponseAtMillis(System.currentTimeMillis())
.build();
}
// If we don't need the network, we're done.
// 4.从缓存里拿response
if (networkRequest == null) {
return cacheResponse.newBuilder()
.cacheResponse(stripBody(cacheResponse))
.build();
}
Response networkResponse = null;
try {
// 5.调用下一个拦截器去请求response
networkResponse = chain.proceed(networkRequest);
} finally {
// If we're crashing on I/O or otherwise, don't leak the cache body.
if (networkResponse == null && cacheCandidate != null) {
closeQuietly(cacheCandidate.body());
}
}
// 6.根据条件判断是用cacheResponse还是networkResponse
if (cacheResponse != null) {
if (networkResponse.code() == HTTP_NOT_MODIFIED) {
Response response = cacheResponse.newBuilder()
.headers(combine(cacheResponse.headers(), networkResponse.headers()))
.sentRequestAtMillis(networkResponse.sentRequestAtMillis())
.receivedResponseAtMillis(networkResponse.receivedResponseAtMillis())
.cacheResponse(stripBody(cacheResponse))
.networkResponse(stripBody(networkResponse))
.build();
networkResponse.body().close();
cache.trackConditionalCacheHit();
cache.update(cacheResponse, response);
return response;
} else {
closeQuietly(cacheResponse.body());
}
}
// 7.使用networkResponse
Response response = networkResponse.newBuilder()
.cacheResponse(stripBody(cacheResponse))
.networkResponse(stripBody(networkResponse))
.build();
// 8.存入缓存
if (cache != null) {
if (HttpHeaders.hasBody(response) && CacheStrategy.isCacheable(response, networkRequest)) {
// Offer this request to the cache.
CacheRequest cacheRequest = cache.put(response);
return cacheWritingResponse(cacheRequest, response);
}
if (HttpMethod.invalidatesCache(networkRequest.method())) {
try {
cache.remove(networkRequest);
} catch (IOException ignored) {
// The cache cannot be written.
}
}
}
return response;
}
- 1.这里获取缓存的response，这里面缓存用到的是DiskLruCache来进行存储
- 2.根据缓存策略获取networkRequest和cacheResponse
/**
* Returns a strategy to satisfy {@code request} using the a cached response {@code response}.
*/
public CacheStrategy get() {
CacheStrategy candidate = getCandidate();
if (candidate.networkRequest != null && request.cacheControl().onlyIfCached()) {
return new CacheStrategy(null, null);
}
return candidate;
}
- 这里调用get方法来获取缓存策略，而这个方法主要通过getCandidate()来获取，我们看下这个方法
private CacheStrategy getCandidate() {
// No cached response.
//1.没有缓存
if (cacheResponse == null) {
return new CacheStrategy(request, null);
}
//2.三次握手失效
if (request.isHttps() && cacheResponse.handshake() == null) {
return new CacheStrategy(request, null);
}
//3 响应不能被缓存
if (!isCacheable(cacheResponse, request)) {
return new CacheStrategy(request, null);
}
CacheControl requestCaching = request.cacheControl();
if (requestCaching.noCache() || hasConditions(request)) {
return new CacheStrategy(request, null);
}
CacheControl responseCaching = cacheResponse.cacheControl();
if (responseCaching.immutable()) {
return new CacheStrategy(null, cacheResponse);
}
long ageMillis = cacheResponseAge();
long freshMillis = computeFreshnessLifetime();
if (requestCaching.maxAgeSeconds() != -1) {
freshMillis = Math.min(freshMillis, SECONDS.toMillis(requestCaching.maxAgeSeconds()));
}
long minFreshMillis = 0;
if (requestCaching.minFreshSeconds() != -1) {
minFreshMillis = SECONDS.toMillis(requestCaching.minFreshSeconds());
}
long maxStaleMillis = 0;
if (!responseCaching.mustRevalidate() && requestCaching.maxStaleSeconds() != -1) {
maxStaleMillis = SECONDS.toMillis(requestCaching.maxStaleSeconds());
}
if (!responseCaching.noCache() && ageMillis + minFreshMillis < freshMillis + maxStaleMillis) {
Response.Builder builder = cacheResponse.newBuilder();
if (ageMillis + minFreshMillis >= freshMillis) {
builder.addHeader("Warning", "110 HttpURLConnection \"Response is stale\"");
}
long oneDayMillis = 24 * 60 * 60 * 1000L;
if (ageMillis > oneDayMillis && isFreshnessLifetimeHeuristic()) {
builder.addHeader("Warning", "113 HttpURLConnection \"Heuristic expiration\"");
}
return new CacheStrategy(null, builder.build());
}
// Find a condition to add to the request. If the condition is satisfied, the response body
// will not be transmitted.
String conditionName;
String conditionValue;
if (etag != null) {
conditionName = "If-None-Match";
conditionValue = etag;
} else if (lastModified != null) {
conditionName = "If-Modified-Since";
conditionValue = lastModifiedString;
} else if (servedDate != null) {
conditionName = "If-Modified-Since";
conditionValue = servedDateString;
} else {
return new CacheStrategy(request, null); // No condition! Make a regular request.
}
Headers.Builder conditionalRequestHeaders = request.headers().newBuilder();
Internal.instance.addLenient(conditionalRequestHeaders, conditionName, conditionValue);
Request conditionalRequest = request.newBuilder()
.headers(conditionalRequestHeaders.build())
.build();
return new CacheStrategy(conditionalRequest, cacheResponse);
}
- 没有缓存就换返回一个response为null的CacheStrategy，代表没有缓存，返回之后就会执行下一个拦截器去请求网络获取response。
- 如果是https并且三次握手失效返回和1一样。
- 代表响应不能被缓存
- 之后就是根据CacheControl来控制返回的结果，用大量的if/else判断缓存是否失效
- 3.回到我们CacheInterceptor的intercept方法的注释3，缓存失效且onlyIfCached为ture就执行这返回504.
- 4.根据我们配置的CacheControl如果设置了ForceCache或者Max-age代表缓存未失效，则就会执行这，不去请求网络直接使用缓存。
- 5.缓存失效，调用后面的拦截器获取Response。
- 6.网络获取的networkResponse与cacheResponse做对比来判断使用哪个response，code==304代表缓存有效，则使用缓存并通过cache.update方法更新缓存。
- 7.缓存过期了则使用networkResponse并存入缓存
- 这里再说下DiskLruCache，用来做缓存的类
//用于缓存的集合
final LinkedHashMap lruEntries = new LinkedHashMap<>(0, 0.75f, true);
//用于清理缓存的线程池
private final Executor executor;
//用于清理缓存的任务
private final Runnable cleanupRunnable = new Runnable() {
public void run() {
synchronized (DiskLruCache.this) {
if (!initialized | closed) {
return; // Nothing to do
}
try {
trimToSize();
} catch (IOException ignored) {
mostRecentTrimFailed = true;
}
try {
if (journalRebuildRequired()) {
rebuildJournal();
redundantOpCount = 0;
}
} catch (IOException e) {
mostRecentRebuildFailed = true;
journalWriter = Okio.buffer(Okio.blackhole());
}
}
}
};
用lruEntries 也就是lru算法执行删除操作，通过BufferedSource以及BufferedSink进行读写操作大大提升了效率。
运用线程池去执行缓存的清理的任务
每一个url请求cache有四个文件，两个状态(DIRY，CLEAN)，每个状态对应两个文件：一个0文件对应存储meta数据，一个文件存储body数据。
这里面的逻辑很复杂有兴趣的可以去具体去了解下。
CacheInterceptor核心还是http协议缓存知识来配置我们的CacheControl来控制缓存的策略。
-
4.ConnectInterceptor，向服务器发起连接
@Override public Response intercept(Chain chain) throws IOException {
RealInterceptorChain realChain = (RealInterceptorChain) chain;
Request request = realChain.request();
//1.得到streamAllocation
StreamAllocation streamAllocation = realChain.streamAllocation();
// We need the network to satisfy this request. Possibly for validating a conditional GET.
boolean doExtensiveHealthChecks = !request.method().equals("GET");
//2.得到httpCodec
HttpCodec httpCodec = streamAllocation.newStream(client, chain, doExtensiveHealthChecks);
//3.得到connection
RealConnection connection = streamAllocation.connection();
return realChain.proceed(request, streamAllocation, httpCodec, connection);
}
- 1.得到streamAllocation对象 也就是RetryAndFollowUpInterceptor中初始化的在这里使用到了
- 2.通过streamAllocation.newStream得到了httpCodec
private RealConnection findHealthyConnection(int connectTimeout, int readTimeout,
int writeTimeout, int pingIntervalMillis, boolean connectionRetryEnabled,
boolean doExtensiveHealthChecks) throws IOException {
while (true) {
RealConnection candidate = findConnection(connectTimeout, readTimeout, writeTimeout,
pingIntervalMillis, connectionRetryEnabled);
// If this is a brand new connection, we can skip the extensive health checks.
synchronized (connectionPool) {
if (candidate.successCount == 0) {
return candidate;
}
}
if (!candidate.isHealthy(doExtensiveHealthChecks)) {
noNewStreams();
continue;
}
return candidate;
}
}
private RealConnection findConnection(int connectTimeout, int readTimeout, int writeTimeout,
int pingIntervalMillis, boolean connectionRetryEnabled) throws IOException {
//.........
if (newRouteSelection) {
// Now that we have a set of IP addresses, make another attempt at getting a connection from
// the pool. This could match due to connection coalescing.
List routes = routeSelection.getAll();
for (int i = 0, size = routes.size(); i < size; i++) {
Route route = routes.get(i);
Internal.instance.get(connectionPool, address, this, route);
if (connection != null) {
foundPooledConnection = true;
result = connection;
this.route = route;
break;
}
}
}
if (!foundPooledConnection) {
if (selectedRoute == null) {
selectedRoute = routeSelection.next();
}
// Create a connection and assign it to this allocation immediately. This makes it possible
// for an asynchronous cancel() to interrupt the handshake we're about to do.
route = selectedRoute;
refusedStreamCount = 0;
result = new RealConnection(connectionPool, selectedRoute);
acquire(result, false);
}
}
// If we found a pooled connection on the 2nd time around, we're done.
if (foundPooledConnection) {
eventListener.connectionAcquired(call, result);
return result;
}
// Do TCP + TLS handshakes. This is a blocking operation.
result.connect(connectTimeout, readTimeout, writeTimeout, pingIntervalMillis,
connectionRetryEnabled, call, eventListener);
routeDatabase().connected(result.route());
Socket socket = null;
synchronized (connectionPool) {
reportedAcquired = true;
// Pool the connection.
Internal.instance.put(connectionPool, result);
//.........
return result;
}
- StreamAllocation的newStream()内部其实是通过findHealthyConnection()方法获取一个RealConnection，而在findHealthyConnection()里面通过一个while(true)死循环不断去调用findConnection()方法去再ConnectionPool中找RealConnection，找不到则直接new一个RealConnection。然后开始握手，握手结束后，把连接加入连接池，如果在连接池有重复连接，和合并连接。
public void connect(int connectTimeout, int readTimeout, int writeTimeout,
int pingIntervalMillis, boolean connectionRetryEnabled, Call call,
EventListener eventListener) {
//........
while (true) {
try {
if (route.requiresTunnel()) {
connectTunnel(connectTimeout, readTimeout, writeTimeout, call, eventListener);
if (rawSocket == null) {
// We were unable to connect the tunnel but properly closed down our resources.
break;
}
} else {
connectSocket(connectTimeout, readTimeout, call, eventListener);
}
establishProtocol(connectionSpecSelector, pingIntervalMillis, call, eventListener);
eventListener.connectEnd(call, route.socketAddress(), route.proxy(), protocol);
break;
} catch (IOException e) {
//...
private void connectTunnel(int connectTimeout, int readTimeout, int writeTimeout, Call call,
EventListener eventListener) throws IOException {
Request tunnelRequest = createTunnelRequest();
HttpUrl url = tunnelRequest.url();
for (int i = 0; i < MAX_TUNNEL_ATTEMPTS; i++) {
connectSocket(connectTimeout, readTimeout, call, eventListener);
tunnelRequest = createTunnel(readTimeout, writeTimeout, tunnelRequest, url);
if (tunnelRequest == null) break; // Tunnel successfully created.
// The proxy decided to close the connection after an auth challenge. We need to create a new
// connection, but this time with the auth credentials.
closeQuietly(rawSocket);
rawSocket = null;
sink = null;
source = null;
eventListener.connectEnd(call, route.socketAddress(), route.proxy(), null);
}
}
private void connectSocket(int connectTimeout, int readTimeout, Call call,
EventListener eventListener) throws IOException {
Proxy proxy = route.proxy();
Address address = route.address();
rawSocket = proxy.type() == Proxy.Type.DIRECT || proxy.type() == Proxy.Type.HTTP
? address.socketFactory().createSocket()
: new Socket(proxy);
eventListener.connectStart(call, route.socketAddress(), proxy);
rawSocket.setSoTimeout(readTimeout);
try {
Platform.get().connectSocket(rawSocket, route.socketAddress(), connectTimeout);
} catch (ConnectException e) {
ConnectException ce = new ConnectException("Failed to connect to " + route.socketAddress());
ce.initCause(e);
throw ce;
}
try {
source = Okio.buffer(Okio.source(rawSocket));
sink = Okio.buffer(Okio.sink(rawSocket));
} catch (NullPointerException npe) {
if (NPE_THROW_WITH_NULL.equals(npe.getMessage())) {
throw new IOException(npe);
}
}
}
private void establishProtocol(ConnectionSpecSelector connectionSpecSelector,
int pingIntervalMillis, Call call, EventListener eventListener) throws IOException {
if (route.address().sslSocketFactory() == null) {
protocol = Protocol.HTTP_1_1;
socket = rawSocket;
return;
}
eventListener.secureConnectStart(call);
connectTls(connectionSpecSelector);
eventListener.secureConnectEnd(call, handshake);
if (protocol == Protocol.HTTP_2) {
socket.setSoTimeout(0); // HTTP/2 connection timeouts are set per-stream.
http2Connection = new Http2Connection.Builder(true)
.socket(socket, route.address().url().host(), source, sink)
.listener(this)
.pingIntervalMillis(pingIntervalMillis)
.build();
http2Connection.start();
}
}
- RealConnection的connect()这个方法很重要。RealConnection的connect()是StreamAllocation调用的。在RealConnection的connect()的方法里面也是一个while(true)的循环，里面判断是隧道连接还是普通连接，如果是隧道连接就走connectTunnel()，如果是普通连接则走connectSocket()，最后建立协议。connectSocket()里面就是通过okio获取source与sink。establishProtocol()方法建立连接，里面判断是是HTTP/1.1还是HTTP/2.0。如果是HTTP/2.0则通过Builder来创建一个Http2Connection对象，并且调用Http2Connection对象的start()方法。所以判断一个RealConnection是否是HTTP/2.0其实很简单，判断RealConnection对象的http2Connection属性是否为null即可，因为只有HTTP/2的时候http2Connection才会被赋值。
- connectSocket()具体实现是AndroidPlatform.java里面的connectSocket()，通过socket建立连接
3.通过streamAllocation得到connection，最后再传入到下一个拦截器
-
5.CallServerInterceptor，负责向服务器发送请求以及接受请求
@Override public Response intercept(Chain chain) throws IOException {
RealInterceptorChain realChain = (RealInterceptorChain) chain;
HttpCodec httpCodec = realChain.httpStream();
StreamAllocation streamAllocation = realChain.streamAllocation();
RealConnection connection = (RealConnection) realChain.connection();
Request request = realChain.request();
long sentRequestMillis = System.currentTimeMillis();
realChain.eventListener().requestHeadersStart(realChain.call());
//1.通过httpCodec写入请求头
httpCodec.writeRequestHeaders(request);
realChain.eventListener().requestHeadersEnd(realChain.call(), request);
Response.Builder responseBuilder = null;
if (HttpMethod.permitsRequestBody(request.method()) && request.body() != null) {
if ("100-continue".equalsIgnoreCase(request.header("Expect"))) {
httpCodec.flushRequest();
realChain.eventListener().responseHeadersStart(realChain.call());
responseBuilder = httpCodec.readResponseHeaders(true);
}
if (responseBuilder == null) {
// Write the request body if the "Expect: 100-continue" expectation was met.
//2.写入请求体
realChain.eventListener().requestBodyStart(realChain.call());
long contentLength = request.body().contentLength();
CountingSink requestBodyOut =
new CountingSink(httpCodec.createRequestBody(request, contentLength));
BufferedSink bufferedRequestBody = Okio.buffer(requestBodyOut);
request.body().writeTo(bufferedRequestBody);
bufferedRequestBody.close();
realChain.eventListener()
.requestBodyEnd(realChain.call(), requestBodyOut.successfulCount);
} else if (!connection.isMultiplexed()) {
streamAllocation.noNewStreams();
}
}
httpCodec.finishRequest();
//3.读响应头
if (responseBuilder == null) {
realChain.eventListener().responseHeadersStart(realChain.call());
responseBuilder = httpCodec.readResponseHeaders(false);
}
Response response = responseBuilder
.request(request)
.handshake(streamAllocation.connection().handshake())
.sentRequestAtMillis(sentRequestMillis)
.receivedResponseAtMillis(System.currentTimeMillis())
.build();
int code = response.code();
if (code == 100) {
responseBuilder = httpCodec.readResponseHeaders(false);
response = responseBuilder
.request(request)
.handshake(streamAllocation.connection().handshake())
.sentRequestAtMillis(sentRequestMillis)
.receivedResponseAtMillis(System.currentTimeMillis())
.build();
code = response.code();
}
realChain.eventListener()
.responseHeadersEnd(realChain.call(), response);
//3.读响应体
if (forWebSocket && code == 101) {
// Connection is upgrading, but we need to ensure interceptors see a non-null response body.
response = response.newBuilder()
.body(Util.EMPTY_RESPONSE)
.build();
} else {
response = response.newBuilder()
.body(httpCodec.openResponseBody(response))
.build();
}
//.....
return response;
}
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该拦截器比较简单，看代码注释就能懂，就是发送请求头请求体，然后读取响应头及响应体。
5713484-a89f541f0f7797a6.png - 感谢 https://www.jianshu.com/p/6166d28983a2