Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / HttpWebResponse.cs / 1305376 / HttpWebResponse.cs
//------------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//-----------------------------------------------------------------------------
namespace System.Net {
using System.IO;
using System.IO.Compression;
using System.Runtime.Serialization;
using System.Globalization;
using System.Security.Cryptography.X509Certificates;
using System.Security.Permissions;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
//
// HttpWebResponse - Handles retrival of HTTP Response headers, und Data reads.
//
///
///
/// An HTTP-specific implementation of the
///
///
[Serializable]
public class HttpWebResponse : WebResponse, ISerializable
{
// response Uri generated by the request.
private Uri m_Uri;
// response Verb gernated by the request
private KnownHttpVerb m_Verb;
// response values
private HttpStatusCode m_StatusCode;
private string m_StatusDescription;
// ConnectStream - for reading actual data
private Stream m_ConnectStream;
private WebHeaderCollection m_HttpResponseHeaders;
// Content Length needed for symantics, -1 if chunked
private long m_ContentLength;
// for which response ContentType we will look for and parse the CharacterSet
private string m_MediaType;
private string m_CharacterSet = null;
private bool m_IsVersionHttp11;
#if !FEATURE_PAL
// server certificate for secure connections
internal X509Certificate m_Certificate;
#endif // !FEATURE_PAL
private CookieCollection m_cookies;
private bool m_disposed; // = false;
private bool m_propertiesDisposed;
private bool m_UsesProxySemantics;
private bool m_IsMutuallyAuthenticated;
//
// Internal Access to the Response Stream,
// public method is GetResponseStream
//
internal Stream ResponseStream {
get {
return m_ConnectStream;
}
set {
m_ConnectStream = value;
}
}
//
public override bool IsMutuallyAuthenticated {
get {
CheckDisposed();
return m_IsMutuallyAuthenticated;
}
}
internal bool InternalSetIsMutuallyAuthenticated {
set {
m_IsMutuallyAuthenticated = value;
}
}
///
/// [To be supplied.]
///
public CookieCollection Cookies {
get {
CheckDisposed();
if (m_cookies == null) {
m_cookies = new CookieCollection();
}
return m_cookies;
}
set {
CheckDisposed();
m_cookies = value;
}
}
// retreives response header object
///
///
/// Gets
/// the headers associated with this response from the server.
///
///
public override WebHeaderCollection Headers {
get {
CheckDisposed();
return m_HttpResponseHeaders;
}
}
// ContentLength, -1 indicates unknown value
///
///
/// Gets the lenght of the content returned by the request.
///
///
public override long ContentLength {
get {
CheckDisposed();
return m_ContentLength;
}
}
///
///
/// Gets the
/// method used to encode the body of the response.
///
///
public String ContentEncoding {
get {
CheckDisposed();
string contentEncoding = m_HttpResponseHeaders[HttpKnownHeaderNames.ContentEncoding];
return contentEncoding == null ? string.Empty : contentEncoding;
}
}
// Returns the Content-Type of the response.
///
///
/// Gets the content type of the
/// response.
///
///
public override string ContentType {
get {
CheckDisposed();
string contentType = m_HttpResponseHeaders.ContentType;
return contentType == null ? string.Empty : contentType;
}
}
///
/// [To be supplied.]
///
public string CharacterSet {
get {
CheckDisposed();
string contentType = m_HttpResponseHeaders.ContentType;
if (m_CharacterSet == null && !ValidationHelper.IsBlankString(contentType)) {
//sets characterset so the branch is never executed again.
m_CharacterSet = String.Empty;
//first string is the media type
string srchString = contentType.ToLower(CultureInfo.InvariantCulture);
//media subtypes of text type has a default as specified by rfc 2616
if (srchString.Trim().StartsWith("text/")) {
m_CharacterSet = "ISO-8859-1";
}
//one of the parameters may be the character set
//there must be at least a mediatype for this to be valid
int i = srchString.IndexOf(";");
if (i > 0) {
//search the parameters
while ((i = srchString.IndexOf("charset",i)) >= 0){
i+=7;
//make sure the word starts with charset
if (srchString[i-8] == ';' || srchString[i-8] == ' '){
//skip whitespace
while (i < srchString.Length && srchString[i] == ' ')
i++;
//only process if next character is '='
//and there is a character after that
if (i < srchString.Length - 1 && srchString[i] == '=') {
i++;
//get and trim character set substring
int j = srchString.IndexOf(';',i);
//In the past we used
//Substring(i, j). J is the offset not the length
//the qfe is to fix the second parameter so that this it is the
//length. since j points to the next ; the operation j -i
//gives the length of the charset
if (j>i)
m_CharacterSet = contentType.Substring(i,j - i).Trim();
else
m_CharacterSet = contentType.Substring(i).Trim();
//done
break;
}
}
}
}
}
return m_CharacterSet;
}
}
///
///
/// Gets the name of the server that sent the response.
///
///
public string Server {
get {
CheckDisposed();
string server = m_HttpResponseHeaders.Server;
return server == null ? string.Empty : server;
}
}
///
///
/// Gets the last
/// date and time that the content of the response was modified.
///
///
public DateTime LastModified {
get {
CheckDisposed();
string lastmodHeaderValue = m_HttpResponseHeaders.LastModified;
if (lastmodHeaderValue == null) {
return DateTime.Now;
}
return HttpProtocolUtils.string2date(lastmodHeaderValue);
}
}
// returns StatusCode
///
///
/// Gets
/// a number indicating the status of the response.
///
///
public HttpStatusCode StatusCode {
get {
CheckDisposed();
return m_StatusCode;
}
}
// returns StatusDescription
///
///
/// Gets the status description returned with the response.
///
///
public string StatusDescription {
get {
CheckDisposed();
return m_StatusDescription;
}
}
// HTTP Version
///
///
/// Gets
/// the version of the HTTP protocol used in the response.
///
///
public Version ProtocolVersion {
get {
CheckDisposed();
return m_IsVersionHttp11 ? HttpVersion.Version11 : HttpVersion.Version10;
}
}
internal bool KeepAlive {
get {
//
// QFE - DevDiv bug: 37757
// If there is proxy involved, independen of the Http Version, we should honor the
// proxy indicated Proxy-Connection header value.
// This header value is not RFC mandated, but is a legacy from Netscape documentations.
// It indicates that the proxy wants to keep the connection.
// Functionally it is equivalent of a Keep-Alive AND/OR Connection header.
//
// The absence of this check will result in HTTP/1.0 responsen be considered to be not
// Keeping the connection alive.
//
// This will result in a state mismatch between the connection pool and HttpWebRequest object
// when the decision to drain the connection and putting it back to the idle pool is made.
//
if (m_UsesProxySemantics)
{
string proxyConnectionHeader = Headers[HttpKnownHeaderNames.ProxyConnection];
if (proxyConnectionHeader != null)
{
return proxyConnectionHeader.ToLower(CultureInfo.InvariantCulture).IndexOf("close") < 0 ||
proxyConnectionHeader.ToLower(CultureInfo.InvariantCulture).IndexOf("keep-alive") >= 0;
}
}
string connectionHeader = Headers[HttpKnownHeaderNames.Connection];
if (connectionHeader != null)
{
connectionHeader = connectionHeader.ToLower(CultureInfo.InvariantCulture);
}
if (ProtocolVersion == HttpVersion.Version10)
{
// An HTTP/1.0 response is keep-alive if it has a connection: keep-alive header
return (connectionHeader != null &&
connectionHeader.IndexOf("keep-alive") >= 0);
}
else if (ProtocolVersion >= HttpVersion.Version11)
{
// An HTTP/1.1 response is keep-alive if it DOESN'T have a connection: close header, or if it
// also has a connection: keep-alive header
return (connectionHeader == null ||
connectionHeader.IndexOf("close") < 0 ||
connectionHeader.IndexOf("keep-alive") >= 0);
}
return false;
}
}
/*++
ResponseStream - Return the response stream.
This property returns the response stream for this response. The
response stream will do de-chunking, etc. as needed.
Input: Nothing. Property is readonly.
Returns: Response stream for response.
--*/
///
/// Gets the stream used for reading the body of the response from the
/// server.
///
public override Stream GetResponseStream() {
if(Logging.On)Logging.Enter(Logging.Web, this, "GetResponseStream", "");
CheckDisposed();
if(Logging.On)Logging.PrintInfo(Logging.Web, "ContentLength="+m_ContentLength);
if(Logging.On)Logging.Exit(Logging.Web, this, "GetResponseStream", m_ConnectStream);
return m_ConnectStream;
}
/*++
Close - Closes the Response after the use.
This causes the read stream to be closed.
--*/
public override void Close() {
if(Logging.On)Logging.Enter(Logging.Web, this, "Close", "");
if (!m_disposed)
{
m_disposed = true;
Stream stream = m_ConnectStream;
ICloseEx icloseEx = stream as ICloseEx;
if (icloseEx != null)
{
icloseEx.CloseEx(CloseExState.Normal /* | CloseExState.Silent */);
}
else if (stream != null)
{
stream.Close();
}
}
if(Logging.On)Logging.Exit(Logging.Web, this, "Close", "");
}
internal void Abort() {
Stream stream = m_ConnectStream;
ICloseEx icloseEx = stream as ICloseEx;
try
{
if (icloseEx != null) {
icloseEx.CloseEx(CloseExState.Abort);
}
else if (stream != null) {
stream.Close();
}
}
catch { }
}
// for backward compat
internal override void OnDispose(){
m_propertiesDisposed = true;
}
internal HttpWebResponse(Uri responseUri, KnownHttpVerb verb, CoreResponseData coreData, string mediaType, bool usesProxySemantics, DecompressionMethods decompressionMethod) {
m_Uri = responseUri;
m_Verb = verb;
m_MediaType = mediaType;
m_UsesProxySemantics = usesProxySemantics;
m_ConnectStream = coreData.m_ConnectStream;
m_HttpResponseHeaders = coreData.m_ResponseHeaders;
m_ContentLength = coreData.m_ContentLength;
m_StatusCode = coreData.m_StatusCode;
m_StatusDescription = coreData.m_StatusDescription;
m_IsVersionHttp11 = coreData.m_IsVersionHttp11;
//if the returned contentlength is zero, preemptively invoke calldone on the stream.
//this will wake up any pending reads.
if (m_ContentLength == 0 && m_ConnectStream is ConnectStream) {
((ConnectStream)m_ConnectStream).CallDone();
}
// handle Content-Location header, by combining it with the orginal request.
string contentLocation = m_HttpResponseHeaders[HttpKnownHeaderNames.ContentLocation];
if (contentLocation != null) {
try {
m_Uri = new Uri(m_Uri, contentLocation);
} catch (UriFormatException e) {
GlobalLog.Assert("Exception on response Uri parsing.", e.ToString());
}
}
// decompress responses by hooking up a final response Stream - only if user required it
if(decompressionMethod != DecompressionMethods.None) {
string contentEncoding = m_HttpResponseHeaders[HttpKnownHeaderNames.ContentEncoding];
if (contentEncoding != null){
if(((decompressionMethod & DecompressionMethods.GZip) != 0) && contentEncoding.IndexOf(HttpWebRequest.GZipHeader) != -1) {
m_ConnectStream = new GZipWrapperStream(m_ConnectStream, CompressionMode.Decompress);
m_ContentLength = -1; // unknown on compressed streams
// Setting a response header after parsing will ruin the Common Header optimization.
// This seems like a corner case. ContentEncoding could be added as a common header, with a special
// property allowing it to be nulled.
m_HttpResponseHeaders[HttpKnownHeaderNames.ContentEncoding] = null;
}
else if (((decompressionMethod & DecompressionMethods.Deflate) != 0) && contentEncoding.IndexOf(HttpWebRequest.DeflateHeader) != -1) {
m_ConnectStream = new DeflateWrapperStream(m_ConnectStream, CompressionMode.Decompress);
m_ContentLength = -1; // unknown on compressed streams
// Setting a response header after parsing will ruin the Common Header optimization.
// This seems like a corner case. ContentEncoding could be added as a common header, with a special
// property allowing it to be nulled.
m_HttpResponseHeaders[HttpKnownHeaderNames.ContentEncoding] = null;
}
}
}
}
//
// ISerializable constructor
//
///
/// [To be supplied.]
///
[Obsolete("Serialization is obsoleted for this type. http://go.microsoft.com/fwlink/?linkid=14202")]
protected HttpWebResponse(SerializationInfo serializationInfo, StreamingContext streamingContext):base(serializationInfo, streamingContext) {
m_HttpResponseHeaders = (WebHeaderCollection)serializationInfo.GetValue("m_HttpResponseHeaders", typeof(WebHeaderCollection));
m_Uri = (Uri)serializationInfo.GetValue("m_Uri", typeof(Uri));
#if !FEATURE_PAL
m_Certificate = (X509Certificate)serializationInfo.GetValue("m_Certificate", typeof(X509Certificate));
#endif // !FEATURE_PAL
Version version = (Version)serializationInfo.GetValue("m_Version", typeof(Version));
m_IsVersionHttp11 = version.Equals(HttpVersion.Version11);
m_StatusCode = (HttpStatusCode)serializationInfo.GetInt32("m_StatusCode");
m_ContentLength = serializationInfo.GetInt64("m_ContentLength");
m_Verb = KnownHttpVerb.Parse(serializationInfo.GetString("m_Verb"));
m_StatusDescription = serializationInfo.GetString("m_StatusDescription");
m_MediaType = serializationInfo.GetString("m_MediaType");
}
//
// ISerializable method
//
///
///
/// Gets a specified header value returned with the response.
///
///
public string GetResponseHeader( string headerName ) {
CheckDisposed();
string headerValue = m_HttpResponseHeaders[headerName];
return ( (headerValue==null) ? String.Empty : headerValue );
}
#if HTTP_HEADER_EXTENSIONS_SUPPORTED
// searches for extension header in response
///
/// [To be supplied.]
///
public string GetExtension(HttpExtension extension, string header) {
CheckDisposed();
return GetResponseHeader(header);
}
#endif
/*++
ResponseUri - Gets the final Response Uri, that includes any
changes that may have transpired from the orginal Request
This property returns Uri for this WebResponse.
Input: Nothing.
Returns: Response Uri for response.
read-only
--*/
///
///
/// Gets the Uniform Resource Indentifier (Uri) of the resource that returned the
/// response.
///
///
public override Uri ResponseUri { // read-only
get {
CheckDisposed();
return m_Uri;
}
}
/*
Accessor: Method
Gets/Sets the http method of this request.
This method represents the Verb,
after any redirects
Returns: Method currently being used.
*/
///
///
/// Gets the value of the method used to return the response.
///
///
public string Method {
get {
CheckDisposed();
return m_Verb.Name;
}
}
private void CheckDisposed() {
if (m_propertiesDisposed) {
throw new ObjectDisposedException(this.GetType().FullName);
}
}
} // class HttpWebResponse
// transfer ICloseEx behavior to nested compound stream.
internal class GZipWrapperStream : GZipStream, ICloseEx, IRequestLifetimeTracker {
public GZipWrapperStream(Stream stream, CompressionMode mode) : base( stream, mode, false) {
}
void ICloseEx.CloseEx(CloseExState closeState) {
ICloseEx icloseEx = BaseStream as ICloseEx;
if (icloseEx != null) {
// since the internal Close() of GZipStream just does Close on our base stream
// we don't have to call it anymore at this point
icloseEx.CloseEx(closeState);
}
else {
Close();
}
}
public override IAsyncResult BeginRead(byte[] buffer, int offset, int size, AsyncCallback callback, Object state) {
if (buffer==null) {
throw new ArgumentNullException("buffer");
}
if (offset<0 || offset>buffer.Length) {
throw new ArgumentOutOfRangeException("offset");
}
if (size<0 || size>buffer.Length-offset) {
throw new ArgumentOutOfRangeException("size");
}
try{
return base.BeginRead(buffer, offset, size, callback, state);
}
catch(Exception e){
try{
if (NclUtilities.IsFatal(e)) throw;
if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){
Close();
}
}
catch{
}
throw e;
}
}
public override int EndRead(IAsyncResult asyncResult) {
if (asyncResult==null) {
throw new ArgumentNullException("asyncResult");
}
try{
return base.EndRead(asyncResult);
}
catch(Exception e){
try{
if (NclUtilities.IsFatal(e)) throw;
if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){
Close();
}
}
catch{
}
throw e;
}
}
public override int Read(byte[] buffer, int offset, int size) {
if (buffer==null) {
throw new ArgumentNullException("buffer");
}
if (offset<0 || offset>buffer.Length) {
throw new ArgumentOutOfRangeException("offset");
}
if (size<0 || size>buffer.Length-offset) {
throw new ArgumentOutOfRangeException("size");
}
try{
return base.Read(buffer, offset, size);
}
catch(Exception e){
try{
if (NclUtilities.IsFatal(e)) throw;
if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){
Close();
}
}
catch{
}
throw e;
}
}
void IRequestLifetimeTracker.TrackRequestLifetime(long requestStartTimestamp)
{
IRequestLifetimeTracker stream = BaseStream as IRequestLifetimeTracker;
Debug.Assert(stream != null, "Wrapped stream must implement IRequestLifetimeTracker interface");
stream.TrackRequestLifetime(requestStartTimestamp);
}
}
internal class DeflateWrapperStream : DeflateStream, ICloseEx, IRequestLifetimeTracker {
public DeflateWrapperStream(Stream stream, CompressionMode mode) : base( stream, mode, false) {
}
void ICloseEx.CloseEx(CloseExState closeState) {
ICloseEx icloseEx = BaseStream as ICloseEx;
if (icloseEx != null) {
// since the internal Close() of GZipStream just does Close on our base stream
// we don't have to call it anymore at this point
icloseEx.CloseEx(closeState);
}
else {
Close();
}
}
public override IAsyncResult BeginRead(byte[] buffer, int offset, int size, AsyncCallback callback, Object state) {
if (buffer==null) {
throw new ArgumentNullException("buffer");
}
if (offset<0 || offset>buffer.Length) {
throw new ArgumentOutOfRangeException("offset");
}
if (size<0 || size>buffer.Length-offset) {
throw new ArgumentOutOfRangeException("size");
}
try{
return base.BeginRead(buffer, offset, size, callback, state);
}
catch(Exception e){
try{
if (NclUtilities.IsFatal(e)) throw;
if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){
Close();
}
}
catch{
}
throw e;
}
}
public override int EndRead(IAsyncResult asyncResult) {
if (asyncResult==null) {
throw new ArgumentNullException("asyncResult");
}
try{
return base.EndRead(asyncResult);
}
catch(Exception e){
try{
if (NclUtilities.IsFatal(e)) throw;
if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){
Close();
}
}
catch{
}
throw e;
}
}
public override int Read(byte[] buffer, int offset, int size) {
if (buffer==null) {
throw new ArgumentNullException("buffer");
}
if (offset<0 || offset>buffer.Length) {
throw new ArgumentOutOfRangeException("offset");
}
if (size<0 || size>buffer.Length-offset) {
throw new ArgumentOutOfRangeException("size");
}
try{
return base.Read(buffer, offset, size);
}
catch(Exception e){
try{
if (NclUtilities.IsFatal(e)) throw;
if(e is System.IO.InvalidDataException || e is InvalidOperationException || e is IndexOutOfRangeException){
Close();
}
}
catch{
}
throw e;
}
}
void IRequestLifetimeTracker.TrackRequestLifetime(long requestStartTimestamp)
{
IRequestLifetimeTracker stream = BaseStream as IRequestLifetimeTracker;
Debug.Assert(stream != null, "Wrapped stream must implement IRequestLifetimeTracker interface");
stream.TrackRequestLifetime(requestStartTimestamp);
}
}
} // namespace System.Net
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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