/**
* Initialize the source for this response. It may be corrected later if the request headers
* forbids network use.
*/
private void initResponseSource() throws IOException {
responseSource = ResponseSource.NETWORK;
if (!policy.getUseCaches()) return;
OkResponseCache responseCache = client.getOkResponseCache();
if (responseCache == null) return;
CacheResponse candidate =
responseCache.get(uri, method, requestHeaders.getHeaders().toMultimap(false));
if (candidate == null) return;
Map<String, List<String>> responseHeadersMap = candidate.getHeaders();
cachedResponseBody = candidate.getBody();
if (!acceptCacheResponseType(candidate)
|| responseHeadersMap == null
|| cachedResponseBody == null) {
Util.closeQuietly(cachedResponseBody);
return;
}
RawHeaders rawResponseHeaders = RawHeaders.fromMultimap(responseHeadersMap, true);
cachedResponseHeaders = new ResponseHeaders(uri, rawResponseHeaders);
long now = System.currentTimeMillis();
this.responseSource = cachedResponseHeaders.chooseResponseSource(now, requestHeaders);
if (responseSource == ResponseSource.CACHE) {
this.cacheResponse = candidate;
setResponse(cachedResponseHeaders, cachedResponseBody);
} else if (responseSource == ResponseSource.CONDITIONAL_CACHE) {
this.cacheResponse = candidate;
} else if (responseSource == ResponseSource.NETWORK) {
Util.closeQuietly(cachedResponseBody);
} else {
throw new AssertionError();
}
}
/**
* Figures out what the response source will be, and opens a socket to that source if necessary.
* Prepares the request headers and gets ready to start writing the request body if it exists.
*/
public final void sendRequest() throws IOException {
if (responseSource != null) {
return;
}
prepareRawRequestHeaders();
initResponseSource();
OkResponseCache responseCache = client.getOkResponseCache();
if (responseCache != null) {
responseCache.trackResponse(responseSource);
}
// The raw response source may require the network, but the request
// headers may forbid network use. In that case, dispose of the network
// response and use a GATEWAY_TIMEOUT response instead, as specified
// by http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.4.
if (requestHeaders.isOnlyIfCached() && responseSource.requiresConnection()) {
if (responseSource == ResponseSource.CONDITIONAL_CACHE) {
Util.closeQuietly(cachedResponseBody);
}
this.responseSource = ResponseSource.CACHE;
this.cacheResponse = GATEWAY_TIMEOUT_RESPONSE;
RawHeaders rawResponseHeaders = RawHeaders.fromMultimap(cacheResponse.getHeaders(), true);
setResponse(new ResponseHeaders(uri, rawResponseHeaders), cacheResponse.getBody());
}
if (responseSource.requiresConnection()) {
sendSocketRequest();
} else if (connection != null) {
client.getConnectionPool().recycle(connection);
connection = null;
}
}
/** Connect to the origin server either directly or via a proxy. */
protected final void connect() throws IOException {
if (connection != null) {
return;
}
if (routeSelector == null) {
String uriHost = uri.getHost();
if (uriHost == null) {
throw new UnknownHostException(uri.toString());
}
SSLSocketFactory sslSocketFactory = null;
HostnameVerifier hostnameVerifier = null;
if (uri.getScheme().equalsIgnoreCase("https")) {
sslSocketFactory = client.getSslSocketFactory();
hostnameVerifier = client.getHostnameVerifier();
}
Address address =
new Address(
uriHost,
getEffectivePort(uri),
sslSocketFactory,
hostnameVerifier,
client.getAuthenticator(),
client.getProxy(),
client.getTransports());
routeSelector =
new RouteSelector(
address,
uri,
client.getProxySelector(),
client.getConnectionPool(),
Dns.DEFAULT,
client.getRoutesDatabase());
}
connection = routeSelector.next(method);
if (!connection.isConnected()) {
connection.connect(client.getConnectTimeout(), client.getReadTimeout(), getTunnelConfig());
client.getConnectionPool().maybeShare(connection);
client.getRoutesDatabase().connected(connection.getRoute());
} else if (!connection.isSpdy()) {
connection.updateReadTimeout(client.getReadTimeout());
}
connected(connection);
if (connection.getRoute().getProxy() != client.getProxy()) {
// Update the request line if the proxy changed; it may need a host name.
requestHeaders.getHeaders().setRequestLine(getRequestLine());
}
}
/**
* Flushes the remaining request header and body, parses the HTTP response headers and starts
* reading the HTTP response body if it exists.
*/
public final void readResponse() throws IOException {
if (hasResponse()) {
responseHeaders.setResponseSource(responseSource);
return;
}
if (responseSource == null) {
throw new IllegalStateException("readResponse() without sendRequest()");
}
if (!responseSource.requiresConnection()) {
return;
}
if (sentRequestMillis == -1) {
if (requestBodyOut instanceof RetryableOutputStream) {
int contentLength = ((RetryableOutputStream) requestBodyOut).contentLength();
requestHeaders.setContentLength(contentLength);
}
transport.writeRequestHeaders();
}
if (requestBodyOut != null) {
requestBodyOut.close();
if (requestBodyOut instanceof RetryableOutputStream) {
transport.writeRequestBody((RetryableOutputStream) requestBodyOut);
}
}
transport.flushRequest();
responseHeaders = transport.readResponseHeaders();
responseHeaders.setLocalTimestamps(sentRequestMillis, System.currentTimeMillis());
responseHeaders.setResponseSource(responseSource);
if (responseSource == ResponseSource.CONDITIONAL_CACHE) {
if (cachedResponseHeaders.validate(responseHeaders)) {
release(false);
ResponseHeaders combinedHeaders = cachedResponseHeaders.combine(responseHeaders);
this.responseHeaders = combinedHeaders;
// Update the cache after applying the combined headers but before initializing the content
// stream, otherwise the Content-Encoding header (if present) will be stripped from the
// combined headers and not end up in the cache file if transparent gzip compression is
// turned on.
OkResponseCache responseCache = client.getOkResponseCache();
responseCache.trackConditionalCacheHit();
responseCache.update(cacheResponse, policy.getHttpConnectionToCache());
initContentStream(cachedResponseBody);
return;
} else {
Util.closeQuietly(cachedResponseBody);
}
}
if (hasResponseBody()) {
maybeCache(); // reentrant. this calls into user code which may call back into this!
}
initContentStream(transport.getTransferStream(cacheRequest));
}
/**
* Populates requestHeaders with defaults and cookies.
*
* <p>This client doesn't specify a default {@code Accept} header because it doesn't know what
* content types the application is interested in.
*/
private void prepareRawRequestHeaders() throws IOException {
requestHeaders.getHeaders().setRequestLine(getRequestLine());
if (requestHeaders.getUserAgent() == null) {
requestHeaders.setUserAgent(getDefaultUserAgent());
}
if (requestHeaders.getHost() == null) {
requestHeaders.setHost(getOriginAddress(policy.getURL()));
}
if ((connection == null || connection.getHttpMinorVersion() != 0)
&& requestHeaders.getConnection() == null) {
requestHeaders.setConnection("Keep-Alive");
}
if (requestHeaders.getAcceptEncoding() == null) {
transparentGzip = true;
requestHeaders.setAcceptEncoding("gzip");
}
if (hasRequestBody() && requestHeaders.getContentType() == null) {
requestHeaders.setContentType("application/x-www-form-urlencoded");
}
long ifModifiedSince = policy.getIfModifiedSince();
if (ifModifiedSince != 0) {
requestHeaders.setIfModifiedSince(new Date(ifModifiedSince));
}
CookieHandler cookieHandler = client.getCookieHandler();
if (cookieHandler != null) {
requestHeaders.addCookies(
cookieHandler.get(uri, requestHeaders.getHeaders().toMultimap(false)));
}
}