/** * 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; } }