HttpEngine.java revision 396af46f45fd302e6309fc48ac1fd68cbb739edb
1/* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18package libcore.net.http; 19 20import java.io.BufferedOutputStream; 21import java.io.ByteArrayInputStream; 22import java.io.IOException; 23import java.io.InputStream; 24import java.io.OutputStream; 25import java.net.CacheRequest; 26import java.net.CacheResponse; 27import java.net.CookieHandler; 28import java.net.HttpURLConnection; 29import java.net.Proxy; 30import java.net.ResponseCache; 31import java.net.URI; 32import java.net.URISyntaxException; 33import java.net.URL; 34import java.nio.charset.Charsets; 35import java.util.Collections; 36import java.util.Date; 37import java.util.HashMap; 38import java.util.List; 39import java.util.Map; 40import java.util.zip.GZIPInputStream; 41import libcore.io.IoUtils; 42import libcore.io.Streams; 43import libcore.util.EmptyArray; 44 45/** 46 * Handles a single HTTP request/response pair. Each HTTP engine follows this 47 * lifecycle: 48 * <ol> 49 * <li>It is created. 50 * <li>The HTTP request message is sent with sendRequest(). Once the request 51 * is sent it is an error to modify the request headers. After 52 * sendRequest() has been called the request body can be written to if 53 * it exists. 54 * <li>The HTTP response message is read with readResponse(). After the 55 * response has been read the response headers and body can be read. 56 * All responses have a response body input stream, though in some 57 * instances this stream is empty. 58 * </ol> 59 * 60 * <p>The request and response may be served by the HTTP response cache, by the 61 * network, or by both in the event of a conditional GET. 62 * 63 * <p>This class may hold a socket connection that needs to be released or 64 * recycled. By default, this socket connection is held when the last byte of 65 * the response is consumed. To release the connection when it is no longer 66 * required, use {@link #automaticallyReleaseConnectionToPool()}. 67 */ 68public class HttpEngine { 69 private static final CacheResponse BAD_GATEWAY_RESPONSE = new CacheResponse() { 70 @Override public Map<String, List<String>> getHeaders() throws IOException { 71 Map<String, List<String>> result = new HashMap<String, List<String>>(); 72 result.put(null, Collections.singletonList("HTTP/1.1 502 Bad Gateway")); 73 return result; 74 } 75 @Override public InputStream getBody() throws IOException { 76 return new ByteArrayInputStream(EmptyArray.BYTE); 77 } 78 }; 79 80 /** 81 * The maximum number of bytes to buffer when sending headers and a request 82 * body. When the headers and body can be sent in a single write, the 83 * request completes sooner. In one WiFi benchmark, using a large enough 84 * buffer sped up some uploads by half. 85 */ 86 private static final int MAX_REQUEST_BUFFER_LENGTH = 32768; 87 88 public static final int DEFAULT_CHUNK_LENGTH = 1024; 89 90 public static final String OPTIONS = "OPTIONS"; 91 public static final String GET = "GET"; 92 public static final String HEAD = "HEAD"; 93 public static final String POST = "POST"; 94 public static final String PUT = "PUT"; 95 public static final String DELETE = "DELETE"; 96 public static final String TRACE = "TRACE"; 97 public static final String CONNECT = "CONNECT"; 98 99 public static final int HTTP_CONTINUE = 100; 100 101 /** 102 * HTTP 1.1 doesn't specify how many redirects to follow, but HTTP/1.0 103 * recommended 5. http://www.w3.org/Protocols/HTTP/1.0/spec.html#Code3xx 104 */ 105 public static final int MAX_REDIRECTS = 5; 106 107 protected final HttpURLConnectionImpl policy; 108 109 protected final String method; 110 111 private ResponseSource responseSource; 112 113 protected HttpConnection connection; 114 private InputStream socketIn; 115 private OutputStream socketOut; 116 117 /** 118 * This stream buffers the request headers and the request body when their 119 * combined size is less than MAX_REQUEST_BUFFER_LENGTH. By combining them 120 * we can save socket writes, which in turn saves a packet transmission. 121 * This is socketOut if the request size is large or unknown. 122 */ 123 private OutputStream requestOut; 124 private AbstractHttpOutputStream requestBodyOut; 125 126 private InputStream responseBodyIn; 127 128 private final ResponseCache responseCache = ResponseCache.getDefault(); 129 private CacheResponse cacheResponse; 130 private CacheRequest cacheRequest; 131 132 /** The time when the request headers were written, or -1 if they haven't been written yet. */ 133 private long sentRequestMillis = -1; 134 135 /** 136 * True if this client added an "Accept-Encoding: gzip" header field and is 137 * therefore responsible for also decompressing the transfer stream. 138 */ 139 private boolean transparentGzip; 140 141 boolean sendChunked; 142 143 /** 144 * The version this client will use. Either 0 for HTTP/1.0, or 1 for 145 * HTTP/1.1. Upon receiving a non-HTTP/1.1 response, this client 146 * automatically sets its version to HTTP/1.0. 147 */ 148 // TODO: is HTTP minor version tracked across HttpEngines? 149 private int httpMinorVersion = 1; // Assume HTTP/1.1 150 151 private final URI uri; 152 153 private final RawHeaders rawRequestHeaders; 154 155 /** Null until a response is received from the network or the cache */ 156 private RawHeaders rawResponseHeaders; 157 158 /* 159 * The cache response currently being validated on a conditional get. Null 160 * if the cached response doesn't exist or doesn't need validation. If the 161 * conditional get succeeds, these will be used for the response headers and 162 * body. If it fails, these be closed and set to null. 163 */ 164 private ResponseHeaders cachedResponseHeaders; 165 private InputStream cachedResponseBody; 166 167 /** 168 * True if the socket connection should be released to the connection pool 169 * when the response has been fully read. 170 */ 171 private boolean automaticallyReleaseConnectionToPool; 172 173 /** True if the socket connection is no longer needed by this engine. */ 174 private boolean connectionReleased; 175 176 /** 177 * @param connection the connection used for an intermediate response 178 * immediately prior to this request/response pair, such as a same-host 179 * redirect. This engine assumes ownership of the connection and must 180 * release it when it is unneeded. 181 */ 182 public HttpEngine(HttpURLConnectionImpl policy, String method, RawHeaders requestHeaders, 183 HttpConnection connection, RetryableOutputStream requestBodyOut) throws IOException { 184 this.policy = policy; 185 this.method = method; 186 this.rawRequestHeaders = new RawHeaders(requestHeaders); 187 this.connection = connection; 188 this.requestBodyOut = requestBodyOut; 189 190 try { 191 uri = policy.getURL().toURILenient(); 192 } catch (URISyntaxException e) { 193 throw new IOException(e); 194 } 195 } 196 197 /** 198 * Figures out what the response source will be, and opens a socket to that 199 * source if necessary. Prepares the request headers and gets ready to start 200 * writing the request body if it exists. 201 */ 202 public final void sendRequest() throws IOException { 203 if (responseSource != null) { 204 return; 205 } 206 207 prepareRawRequestHeaders(); 208 RequestHeaders cacheRequestHeaders = new RequestHeaders(uri, rawRequestHeaders); 209 initResponseSource(cacheRequestHeaders); 210 if (responseCache instanceof HttpResponseCache) { 211 ((HttpResponseCache) responseCache).trackResponse(responseSource); 212 } 213 214 /* 215 * The raw response source may require the network, but the request 216 * headers may forbid network use. In that case, dispose of the network 217 * response and use a BAD_GATEWAY response instead. 218 */ 219 if (cacheRequestHeaders.onlyIfCached && responseSource.requiresConnection()) { 220 if (responseSource == ResponseSource.CONDITIONAL_CACHE) { 221 IoUtils.closeQuietly(cachedResponseBody); 222 } 223 this.responseSource = ResponseSource.CACHE; 224 this.cacheResponse = BAD_GATEWAY_RESPONSE; 225 setResponse(RawHeaders.fromMultimap(cacheResponse.getHeaders()), 226 cacheResponse.getBody()); 227 } 228 229 if (responseSource.requiresConnection()) { 230 sendSocketRequest(); 231 } else if (connection != null) { 232 HttpConnectionPool.INSTANCE.recycle(connection); 233 connection = null; 234 } 235 } 236 237 /** 238 * Initialize the source for this response. It may be corrected later if the 239 * request headers forbids network use. 240 */ 241 private void initResponseSource(RequestHeaders cacheRequestHeaders) throws IOException { 242 responseSource = ResponseSource.NETWORK; 243 if (!policy.getUseCaches() || responseCache == null) { 244 return; 245 } 246 247 CacheResponse candidate = responseCache.get(uri, method, rawRequestHeaders.toMultimap()); 248 if (candidate == null) { 249 return; 250 } 251 252 Map<String, List<String>> responseHeadersMap = candidate.getHeaders(); 253 cachedResponseBody = candidate.getBody(); 254 if (!acceptCacheResponseType(candidate) 255 || responseHeadersMap == null 256 || cachedResponseBody == null) { 257 IoUtils.closeQuietly(cachedResponseBody); 258 return; 259 } 260 261 RawHeaders rawHeaders = RawHeaders.fromMultimap(responseHeadersMap); 262 cachedResponseHeaders = new ResponseHeaders(uri, rawHeaders); 263 long now = System.currentTimeMillis(); 264 this.responseSource = cachedResponseHeaders.chooseResponseSource(now, cacheRequestHeaders); 265 if (responseSource == ResponseSource.CACHE) { 266 this.cacheResponse = candidate; 267 setResponse(rawHeaders, cachedResponseBody); 268 } else if (responseSource == ResponseSource.CONDITIONAL_CACHE) { 269 this.cacheResponse = candidate; 270 } else if (responseSource == ResponseSource.NETWORK) { 271 IoUtils.closeQuietly(cachedResponseBody); 272 } else { 273 throw new AssertionError(); 274 } 275 } 276 277 private void sendSocketRequest() throws IOException { 278 if (connection == null) { 279 connect(); 280 } 281 282 if (socketOut != null || requestOut != null || socketIn != null) { 283 throw new IllegalStateException(); 284 } 285 286 socketOut = connection.getOutputStream(); 287 requestOut = socketOut; 288 socketIn = connection.getInputStream(); 289 290 if (hasRequestBody()) { 291 initRequestBodyOut(); 292 } 293 } 294 295 /** 296 * Connect to the origin server either directly or via a proxy. 297 */ 298 protected void connect() throws IOException { 299 if (connection == null) { 300 connection = openSocketConnection(); 301 } 302 } 303 304 protected final HttpConnection openSocketConnection() throws IOException { 305 HttpConnection result = HttpConnection.connect( 306 uri, policy.getProxy(), requiresTunnel(), policy.getConnectTimeout()); 307 Proxy proxy = result.getAddress().getProxy(); 308 if (proxy != null) { 309 policy.setProxy(proxy); 310 } 311 result.setSoTimeout(policy.getReadTimeout()); 312 return result; 313 } 314 315 protected void initRequestBodyOut() throws IOException { 316 int contentLength = -1; 317 String contentLengthString = rawRequestHeaders.get("Content-Length"); 318 if (contentLengthString != null) { 319 contentLength = Integer.parseInt(contentLengthString); 320 } 321 322 String encoding = rawRequestHeaders.get("Transfer-Encoding"); 323 int chunkLength = policy.getChunkLength(); 324 if (chunkLength > 0 || "chunked".equalsIgnoreCase(encoding)) { 325 sendChunked = true; 326 contentLength = -1; 327 if (chunkLength == -1) { 328 chunkLength = DEFAULT_CHUNK_LENGTH; 329 } 330 } 331 332 if (socketOut == null) { 333 throw new IllegalStateException("No socket to write to; was a POST cached?"); 334 } 335 336 if (httpMinorVersion == 0) { 337 sendChunked = false; 338 } 339 340 int fixedContentLength = policy.getFixedContentLength(); 341 if (requestBodyOut != null) { 342 // request body was already initialized by the predecessor HTTP engine 343 } else if (fixedContentLength != -1) { 344 writeRequestHeaders(fixedContentLength); 345 requestBodyOut = new FixedLengthOutputStream(requestOut, fixedContentLength); 346 } else if (sendChunked) { 347 writeRequestHeaders(-1); 348 requestBodyOut = new ChunkedOutputStream(requestOut, chunkLength); 349 } else if (contentLength != -1) { 350 writeRequestHeaders(contentLength); 351 requestBodyOut = new RetryableOutputStream(contentLength); 352 } else { 353 requestBodyOut = new RetryableOutputStream(); 354 } 355 } 356 357 /** 358 * @param body the response body, or null if it doesn't exist or isn't 359 * available. 360 */ 361 private void setResponse(RawHeaders headers, InputStream body) throws IOException { 362 if (this.responseBodyIn != null) { 363 throw new IllegalStateException(); 364 } 365 this.rawResponseHeaders = headers; 366 this.httpMinorVersion = rawResponseHeaders.getHttpMinorVersion(); 367 if (body != null) { 368 initContentStream(body); 369 } 370 } 371 372 private boolean hasRequestBody() { 373 return method == POST || method == PUT; 374 } 375 376 /** 377 * Returns the request body or null if this request doesn't have a body. 378 */ 379 public final OutputStream getRequestBody() { 380 if (responseSource == null) { 381 throw new IllegalStateException(); 382 } 383 return requestBodyOut; 384 } 385 386 public final boolean hasResponse() { 387 return rawResponseHeaders != null; 388 } 389 390 public final RawHeaders getRequestHeaders() { 391 return rawRequestHeaders; 392 } 393 394 public final RawHeaders getResponseHeaders() { 395 if (rawResponseHeaders == null) { 396 throw new IllegalStateException(); 397 } 398 return rawResponseHeaders; 399 } 400 401 public final InputStream getResponseBody() { 402 if (rawResponseHeaders == null) { 403 throw new IllegalStateException(); 404 } 405 return responseBodyIn; 406 } 407 408 public final CacheResponse getCacheResponse() { 409 if (rawResponseHeaders == null) { 410 throw new IllegalStateException(); 411 } 412 return cacheResponse; 413 } 414 415 public final HttpConnection getConnection() { 416 return connection; 417 } 418 419 /** 420 * Returns true if {@code cacheResponse} is of the right type. This 421 * condition is necessary but not sufficient for the cached response to 422 * be used. 423 */ 424 protected boolean acceptCacheResponseType(CacheResponse cacheResponse) { 425 return true; 426 } 427 428 private void maybeCache() throws IOException { 429 // Are we caching at all? 430 if (!policy.getUseCaches() || responseCache == null) { 431 return; 432 } 433 434 // Should we cache this response for this request? 435 RequestHeaders requestCacheHeaders = new RequestHeaders(uri, rawRequestHeaders); 436 ResponseHeaders responseCacheHeaders = new ResponseHeaders(uri, rawResponseHeaders); 437 if (!responseCacheHeaders.isCacheable(requestCacheHeaders)) { 438 return; 439 } 440 441 // Offer this request to the cache. 442 cacheRequest = responseCache.put(uri, getHttpConnectionToCache()); 443 } 444 445 protected HttpURLConnection getHttpConnectionToCache() { 446 return policy; 447 } 448 449 /** 450 * Cause the socket connection to be released to the connection pool when 451 * it is no longer needed. If it is already unneeded, it will be pooled 452 * immediately. 453 */ 454 public final void automaticallyReleaseConnectionToPool() { 455 automaticallyReleaseConnectionToPool = true; 456 if (connection != null && connectionReleased) { 457 HttpConnectionPool.INSTANCE.recycle(connection); 458 connection = null; 459 } 460 } 461 462 /** 463 * Releases this engine so that its resources may be either reused or 464 * closed. 465 */ 466 public final void release(boolean reusable) { 467 // If the response body comes from the cache, close it. 468 if (responseBodyIn == cachedResponseBody) { 469 IoUtils.closeQuietly(responseBodyIn); 470 } 471 472 if (!connectionReleased && connection != null) { 473 connectionReleased = true; 474 475 // We cannot reuse sockets that have incomplete output. 476 if (requestBodyOut != null && !requestBodyOut.closed) { 477 reusable = false; 478 } 479 480 // If the headers specify that the connection shouldn't be reused, don't reuse it. 481 if (hasConnectionCloseHeaders()) { 482 reusable = false; 483 } 484 485 if (responseBodyIn instanceof UnknownLengthHttpInputStream) { 486 reusable = false; 487 } 488 489 if (reusable && responseBodyIn != null) { 490 // We must discard the response body before the connection can be reused. 491 try { 492 Streams.skipAll(responseBodyIn); 493 } catch (IOException e) { 494 reusable = false; 495 } 496 } 497 498 if (!reusable) { 499 connection.closeSocketAndStreams(); 500 connection = null; 501 } else if (automaticallyReleaseConnectionToPool) { 502 HttpConnectionPool.INSTANCE.recycle(connection); 503 connection = null; 504 } 505 } 506 } 507 508 private void initContentStream(InputStream transferStream) throws IOException { 509 if (transparentGzip 510 && "gzip".equalsIgnoreCase(rawResponseHeaders.get("Content-Encoding"))) { 511 /* 512 * If the response was transparently gzipped, remove the gzip header field 513 * so clients don't double decompress. http://b/3009828 514 */ 515 rawResponseHeaders.removeAll("Content-Encoding"); 516 responseBodyIn = new GZIPInputStream(transferStream); 517 } else { 518 responseBodyIn = transferStream; 519 } 520 } 521 522 private InputStream getTransferStream() throws IOException { 523 if (!hasResponseBody()) { 524 return new FixedLengthInputStream(socketIn, cacheRequest, this, 0); 525 } 526 527 if ("chunked".equalsIgnoreCase(rawResponseHeaders.get("Transfer-Encoding"))) { 528 return new ChunkedInputStream(socketIn, cacheRequest, this); 529 } 530 531 String contentLength = rawResponseHeaders.get("Content-Length"); 532 if (contentLength != null) { 533 try { 534 int length = Integer.parseInt(contentLength); 535 return new FixedLengthInputStream(socketIn, cacheRequest, this, length); 536 } catch (NumberFormatException ignored) { 537 } 538 } 539 540 /* 541 * Wrap the input stream from the HttpConnection (rather than 542 * just returning "socketIn" directly here), so that we can control 543 * its use after the reference escapes. 544 */ 545 return new UnknownLengthHttpInputStream(socketIn, cacheRequest, this); 546 } 547 548 private void readResponseHeaders() throws IOException { 549 RawHeaders headers; 550 do { 551 headers = new RawHeaders(); 552 headers.setStatusLine(Streams.readAsciiLine(socketIn)); 553 readHeaders(headers); 554 setResponse(headers, null); 555 } while (headers.getResponseCode() == HTTP_CONTINUE); 556 } 557 558 /** 559 * Returns true if the response must have a (possibly 0-length) body. 560 * See RFC 2616 section 4.3. 561 */ 562 public final boolean hasResponseBody() { 563 int responseCode = rawResponseHeaders.getResponseCode(); 564 if (method != HEAD 565 && method != CONNECT 566 && (responseCode < HTTP_CONTINUE || responseCode >= 200) 567 && responseCode != HttpURLConnectionImpl.HTTP_NO_CONTENT 568 && responseCode != HttpURLConnectionImpl.HTTP_NOT_MODIFIED) { 569 return true; 570 } 571 572 /* 573 * If the Content-Length or Transfer-Encoding headers disagree with the 574 * response code, the response is malformed. For best compatibility, we 575 * honor the headers. 576 */ 577 String contentLength = rawResponseHeaders.get("Content-Length"); 578 if (contentLength != null && Integer.parseInt(contentLength) > 0) { 579 return true; 580 } 581 if ("chunked".equalsIgnoreCase(rawResponseHeaders.get("Transfer-Encoding"))) { 582 return true; 583 } 584 585 return false; 586 } 587 588 /** 589 * Trailers are headers included after the last chunk of a response encoded 590 * with chunked encoding. 591 */ 592 final void readTrailers() throws IOException { 593 readHeaders(rawResponseHeaders); 594 } 595 596 private void readHeaders(RawHeaders headers) throws IOException { 597 // parse the result headers until the first blank line 598 String line; 599 while (!(line = Streams.readAsciiLine(socketIn)).isEmpty()) { 600 headers.addLine(line); 601 } 602 603 CookieHandler cookieHandler = CookieHandler.getDefault(); 604 if (cookieHandler != null) { 605 cookieHandler.put(uri, headers.toMultimap()); 606 } 607 } 608 609 /** 610 * Prepares the HTTP headers and sends them to the server. 611 * 612 * <p>For streaming requests with a body, headers must be prepared 613 * <strong>before</strong> the output stream has been written to. Otherwise 614 * the body would need to be buffered! 615 * 616 * <p>For non-streaming requests with a body, headers must be prepared 617 * <strong>after</strong> the output stream has been written to and closed. 618 * This ensures that the {@code Content-Length} header field receives the 619 * proper value. 620 * 621 * @param contentLength the number of bytes in the request body, or -1 if 622 * the request body length is unknown. 623 */ 624 private void writeRequestHeaders(int contentLength) throws IOException { 625 if (sentRequestMillis != -1) { 626 throw new IllegalStateException(); 627 } 628 629 RawHeaders headersToSend = getNetworkRequestHeaders(); 630 byte[] bytes = headersToSend.toHeaderString().getBytes(Charsets.ISO_8859_1); 631 632 if (contentLength != -1 && bytes.length + contentLength <= MAX_REQUEST_BUFFER_LENGTH) { 633 requestOut = new BufferedOutputStream(socketOut, bytes.length + contentLength); 634 } 635 636 sentRequestMillis = System.currentTimeMillis(); 637 requestOut.write(bytes); 638 } 639 640 /** 641 * Returns the headers to send on a network request. 642 * 643 * <p>This adds the content length and content-type headers, which are 644 * neither needed nor known when querying the response cache. 645 * 646 * <p>It updates the status line, which may need to be fully qualified if 647 * the connection is using a proxy. 648 */ 649 protected RawHeaders getNetworkRequestHeaders() throws IOException { 650 rawRequestHeaders.setStatusLine(getRequestLine()); 651 652 int fixedContentLength = policy.getFixedContentLength(); 653 if (fixedContentLength != -1) { 654 rawRequestHeaders.addIfAbsent("Content-Length", Integer.toString(fixedContentLength)); 655 } else if (sendChunked) { 656 rawRequestHeaders.addIfAbsent("Transfer-Encoding", "chunked"); 657 } else if (requestBodyOut instanceof RetryableOutputStream) { 658 int size = ((RetryableOutputStream) requestBodyOut).contentLength(); 659 rawRequestHeaders.addIfAbsent("Content-Length", Integer.toString(size)); 660 } 661 662 return rawRequestHeaders; 663 } 664 665 /** 666 * Populates requestHeaders with defaults and cookies. 667 * 668 * <p>This client doesn't specify a default {@code Accept} header because it 669 * doesn't know what content types the application is interested in. 670 */ 671 private void prepareRawRequestHeaders() throws IOException { 672 rawRequestHeaders.setStatusLine(getRequestLine()); 673 674 if (rawRequestHeaders.get("User-Agent") == null) { 675 rawRequestHeaders.add("User-Agent", getDefaultUserAgent()); 676 } 677 678 if (rawRequestHeaders.get("Host") == null) { 679 rawRequestHeaders.add("Host", getOriginAddress(policy.getURL())); 680 } 681 682 if (httpMinorVersion > 0) { 683 rawRequestHeaders.addIfAbsent("Connection", "Keep-Alive"); 684 } 685 686 if (rawRequestHeaders.get("Accept-Encoding") == null) { 687 transparentGzip = true; 688 rawRequestHeaders.add("Accept-Encoding", "gzip"); 689 } 690 691 if (hasRequestBody()) { 692 rawRequestHeaders.addIfAbsent("Content-Type", "application/x-www-form-urlencoded"); 693 } 694 695 long ifModifiedSince = policy.getIfModifiedSince(); 696 if (ifModifiedSince != 0) { 697 rawRequestHeaders.add("If-Modified-Since", HttpDate.format(new Date(ifModifiedSince))); 698 } 699 700 CookieHandler cookieHandler = CookieHandler.getDefault(); 701 if (cookieHandler != null) { 702 Map<String, List<String>> allCookieHeaders 703 = cookieHandler.get(uri, rawRequestHeaders.toMultimap()); 704 for (Map.Entry<String, List<String>> entry : allCookieHeaders.entrySet()) { 705 String key = entry.getKey(); 706 if ("Cookie".equalsIgnoreCase(key) || "Cookie2".equalsIgnoreCase(key)) { 707 rawRequestHeaders.addAll(key, entry.getValue()); 708 } 709 } 710 } 711 } 712 713 private String getRequestLine() { 714 String protocol = (httpMinorVersion == 0) ? "HTTP/1.0" : "HTTP/1.1"; 715 return method + " " + requestString() + " " + protocol; 716 } 717 718 private String requestString() { 719 URL url = policy.getURL(); 720 if (includeAuthorityInRequestLine()) { 721 return url.toString(); 722 } else { 723 String fileOnly = url.getFile(); 724 if (fileOnly == null || fileOnly.isEmpty()) { 725 fileOnly = "/"; 726 } 727 return fileOnly; 728 } 729 } 730 731 /** 732 * Returns true if the request line should contain the full URL with host 733 * and port (like "GET http://android.com/foo HTTP/1.1") or only the path 734 * (like "GET /foo HTTP/1.1"). 735 * 736 * <p>This is non-final because for HTTPS it's never necessary to supply the 737 * full URL, even if a proxy is in use. 738 */ 739 protected boolean includeAuthorityInRequestLine() { 740 return policy.usingProxy(); 741 } 742 743 protected final String getDefaultUserAgent() { 744 String agent = System.getProperty("http.agent"); 745 return agent != null ? agent : ("Java" + System.getProperty("java.version")); 746 } 747 748 private boolean hasConnectionCloseHeaders() { 749 return (rawResponseHeaders != null 750 && "close".equalsIgnoreCase(rawResponseHeaders.get("Connection"))) 751 || ("close".equalsIgnoreCase(rawRequestHeaders.get("Connection"))); 752 } 753 754 protected final String getOriginAddress(URL url) { 755 int port = url.getPort(); 756 String result = url.getHost(); 757 if (port > 0 && port != policy.getDefaultPort()) { 758 result = result + ":" + port; 759 } 760 return result; 761 } 762 763 protected boolean requiresTunnel() { 764 return false; 765 } 766 767 /** 768 * Flushes the remaining request header and body, parses the HTTP response 769 * headers and starts reading the HTTP response body if it exists. 770 */ 771 public final void readResponse() throws IOException { 772 if (hasResponse()) { 773 return; 774 } 775 776 if (responseSource == null) { 777 throw new IllegalStateException("readResponse() without sendRequest()"); 778 } 779 780 if (!responseSource.requiresConnection()) { 781 return; 782 } 783 784 if (sentRequestMillis == -1) { 785 int contentLength = requestBodyOut instanceof RetryableOutputStream 786 ? ((RetryableOutputStream) requestBodyOut).contentLength() 787 : -1; 788 writeRequestHeaders(contentLength); 789 } 790 791 if (requestBodyOut != null) { 792 requestBodyOut.close(); 793 if (requestBodyOut instanceof RetryableOutputStream) { 794 ((RetryableOutputStream) requestBodyOut).writeToSocket(requestOut); 795 } 796 } 797 798 requestOut.flush(); 799 requestOut = socketOut; 800 801 readResponseHeaders(); 802 rawResponseHeaders.add(ResponseHeaders.SENT_MILLIS, Long.toString(sentRequestMillis)); 803 rawResponseHeaders.add(ResponseHeaders.RECEIVED_MILLIS, 804 Long.toString(System.currentTimeMillis())); 805 806 if (responseSource == ResponseSource.CONDITIONAL_CACHE) { 807 if (cachedResponseHeaders.validate(new ResponseHeaders(uri, rawResponseHeaders))) { 808 if (responseCache instanceof HttpResponseCache) { 809 ((HttpResponseCache) responseCache).trackConditionalCacheHit(); 810 } 811 // discard the network response and use the cache response 812 release(true); 813 setResponse(cachedResponseHeaders.headers, cachedResponseBody); 814 return; 815 } else { 816 IoUtils.closeQuietly(cachedResponseBody); 817 } 818 } 819 820 if (hasResponseBody()) { 821 maybeCache(); // reentrant. this calls into user code which may call back into this! 822 } 823 824 initContentStream(getTransferStream()); 825 } 826} 827