/// <include file='IWebClient.xml' path='/IWebClient/SendRequest_WebRequest/*'/>
public WebResponse SendRequest(WebRequest webRequest)
{
var httpWebRequest = (HttpWebRequest)System.Net.WebRequest.Create(webRequest.Destination);
httpWebRequest.Method = webRequest.Type.ToString().ToUpperInvariant();
// We shall handle redirects by hand so that we may capture cookies and properly
// handle login forms.
//
// Automating Web Login With HttpWebRequest
// https://www.stevefenton.co.uk/Content/Blog/Date/201210/Blog/Automating-Web-Login-With-HttpWebRequest/
httpWebRequest.AllowAutoRedirect = false;
// Default headers.
httpWebRequest.Accept = "*/*";
httpWebRequest.UserAgent = UserAgent;
// Set and/or override any provided headers.
foreach (var headerName in webRequest.Headers.AllKeys)
{
ConfigureHeader(httpWebRequest, headerName, webRequest.Headers[headerName]);
}
httpWebRequest.CookieContainer = new CookieContainer();
httpWebRequest.CookieContainer.Add(cookieJar.GetCookies(webRequest.Destination));
if (webRequest.Type == WebRequestType.Post)
{
var postRequest = (PostWebRequest)webRequest;
var requestDataBytes = Encoding.UTF8.GetBytes(postRequest.RequestData);
Stream requestStream = null;
httpWebRequest.ContentLength = requestDataBytes.Length;
httpWebRequest.ContentType = postRequest.ContentType;
httpWebRequest.ServicePoint.Expect100Continue = false;
try {
requestStream = httpWebRequest.GetRequestStream();
requestStream.Write(requestDataBytes, 0, requestDataBytes.Length);
}
finally {
requestStream?.Close();
}
}
OnSendingRequest(new SendingRequestEventArgs(webRequest));
WebResponse response;
HttpWebResponse webResponse = null;
try {
webResponse = ( HttpWebResponse )httpWebRequest.GetResponse();
OnProcessingResponse(new ProcessingResponseEventArgs(webResponse));
if (httpWebRequest.HaveResponse)
{
var responseCookies = new CookieCollection {
webResponse.Cookies
};
// Some cookies in the Set-Cookie header can be omitted from the response's CookieCollection. For example:
// Set-Cookie:ADCDownloadAuth=[long token];Version=1;Comment=;Domain=apple.com;Path=/;Max-Age=108000;HttpOnly;Expires=Tue, 03 May 2016 13:30:57 GMT
//
// See also:
// http://stackoverflow.com/questions/15103513/httpwebresponse-cookies-empty-despite-set-cookie-header-no-redirect
//
// To catch these, we parse the header manually and add any cookie that is missing.
if (webResponse.Headers.AllKeys.Contains(CommonHeaders.SetCookie))
{
var responseCookieList = responseCookies.OfType <Cookie>().ToList();
var cookies = NScrapeUtility.ParseSetCookieHeader(webResponse.Headers[CommonHeaders.SetCookie], httpWebRequest.Host);
foreach (var cookie in cookies)
{
if (responseCookieList.All(c => c.Name != cookie.Name))
{
responseCookies.Add(cookie);
}
}
}
// Handle cookies that are offered
foreach (Cookie responseCookie in responseCookies)
{
var cookieFound = false;
foreach (Cookie existingCookie in cookieJar.GetCookies(webRequest.Destination))
{
if (responseCookie.Name.Equals(existingCookie.Name))
{
existingCookie.Value = responseCookie.Value;
cookieFound = true;
}
}
if (!cookieFound)
{
var args = new AddingCookieEventArgs(responseCookie);
OnAddingCookie(args);
if (!args.Cancel)
{
cookieJar.Add(responseCookie);
}
}
}
if (redirectionStatusCodes.Contains(webResponse.StatusCode))
{
// We have a redirected response, so get the new location.
var location = webResponse.Headers[CommonHeaders.Location];
// Locations should always be absolute, per the RFC (http://tools.ietf.org/html/rfc2616#section-14.30), but
// that won't always be the case.
Uri redirectUri;
if (Uri.IsWellFormedUriString(location, UriKind.Absolute))
{
redirectUri = new Uri(location);
}
else
{
redirectUri = new Uri(webRequest.Destination, new Uri(location, UriKind.Relative));
}
if (webRequest.AutoRedirect)
{
// We are auto redirecting, so make a recursive call to perform the redirect by hand.
response = SendRequest(new GetWebRequest(redirectUri));
}
else
{
// We are not auto redirecting, so send the caller a redirect response.
response = new RedirectedWebResponse(webResponse.ResponseUri, webRequest, redirectUri);
}
webResponse.Dispose();
}
else
{
// We have a non-redirected response.
response = WebResponseFactory.CreateResponse(webResponse);
if (response.ResponseType == WebResponseType.Html)
{
// We have an HTML response, so check for an old school Meta refresh tag
var metaRefreshUrl = GetMetaRefreshUrl((( HtmlWebResponse )response).Html);
if (!string.IsNullOrWhiteSpace(metaRefreshUrl))
{
// The page has a Meta refresh tag, so build the redirect Url
var redirectUri = new Uri(response.ResponseUrl, metaRefreshUrl);
if (webRequest.AutoRedirect)
{
response.Dispose();
// We are auto redirecting, so make a recursive call to perform the redirect
response = SendRequest(new GetWebRequest(redirectUri, httpWebRequest.AllowAutoRedirect));
}
else
{
var responseUrl = response.ResponseUrl;
response.Dispose();
// We are not auto redirecting, so send the caller a redirect response
response = new RedirectedWebResponse(responseUrl, webRequest, redirectUri);
}
}
}
}
}
else
{
response = new ExceptionWebResponse(webRequest.Destination, new WebException(NScrapeResources.NoResponse));
webResponse.Dispose();
}
}
catch (WebException ex) {
response = new ExceptionWebResponse(webRequest.Destination, ex);
webResponse?.Dispose();
}
return(response);
}
/// <include file='IWebClient.xml' path='/IWebClient/SendRequest_WebRequest/*'/>
public WebResponse SendRequest(WebRequest webRequest)
{
var httpWebRequest = (HttpWebRequest)System.Net.WebRequest.Create(webRequest.Destination);
httpWebRequest.Method = webRequest.Type.ToString().ToUpperInvariant();
// We shall handle redirects by hand so that we may capture cookies and properly
// handle login forms.
//
// Automating Web Login With HttpWebRequest
// https://www.stevefenton.co.uk/Content/Blog/Date/201210/Blog/Automating-Web-Login-With-HttpWebRequest/
httpWebRequest.AllowAutoRedirect = false;
// Default headers.
httpWebRequest.Accept = "*/*";
httpWebRequest.UserAgent = UserAgent;
// Set and/or override any provided headers.
foreach (var headerName in webRequest.Headers.AllKeys)
{
ConfigureHeader(httpWebRequest, headerName, webRequest.Headers[headerName]);
}
httpWebRequest.CookieContainer = new CookieContainer();
httpWebRequest.CookieContainer.Add(webRequest.Destination, cookieJar.GetCookies(webRequest.Destination));
if (webRequest.Type == WebRequestType.Post)
{
var postRequest = (PostWebRequest)webRequest;
var requestDataBytes = Encoding.UTF8.GetBytes(postRequest.RequestData);
Stream requestStream = null;
httpWebRequest.ContentLength = requestDataBytes.Length;
httpWebRequest.ContentType = postRequest.ContentType;
try {
requestStream = httpWebRequest.GetRequestStreamAsync().Result;
requestStream.Write(requestDataBytes, 0, requestDataBytes.Length);
}
finally {
requestStream?.Dispose();
}
}
OnSendingRequest(new SendingRequestEventArgs(webRequest));
WebResponse response;
HttpWebResponse webResponse = null;
try {
try {
webResponse = ( HttpWebResponse )httpWebRequest.GetResponseAsync().Result;
}
catch (AggregateException ex) {
// While the line above executes without exception under the .Net Framework, under
// .Net Core, it will throw an exception for non-successful (non-200) status codes.
// However, the response we need is buried within the exception, so pull it out and
// continue.
//
// See thread on the following page, notably the comment from davidsh on Sep 6, 2017:
//
// HttpWebRequest in .NET Core 2.0 throwing 301 Moved Permanently #23422
// https://github.com/dotnet/corefx/issues/23422
if (ex.InnerExceptions.Count == 1)
{
if (ex.InnerExceptions[0] is WebException webException)
{
if (webException.Response is HttpWebResponse httpWebResponse)
{
webResponse = httpWebResponse;
}
}
}
if (webResponse == null)
{
// The exception was not as expected so we can't process it.
throw;
}
}
OnProcessingResponse(new ProcessingResponseEventArgs(webResponse));
if (httpWebRequest.HaveResponse)
{
var responseCookies = new CookieCollection {
webResponse.Cookies
};
// Some cookies in the Set-Cookie header can be omitted from the response's CookieCollection. For example:
// Set-Cookie:ADCDownloadAuth=[long token];Version=1;Comment=;Domain=apple.com;Path=/;Max-Age=108000;HttpOnly;Expires=Tue, 03 May 2016 13:30:57 GMT
//
// See also:
// http://stackoverflow.com/questions/15103513/httpwebresponse-cookies-empty-despite-set-cookie-header-no-redirect
//
// To catch these, we parse the header manually and add any cookie that is missing.
if (webResponse.Headers.AllKeys.Contains(CommonHeaders.SetCookie))
{
var responseCookieList = responseCookies.OfType <Cookie>().ToList();
var host = httpWebRequest.Host;
var cookies = NScrapeUtility.ParseSetCookieHeader(webResponse.Headers[CommonHeaders.SetCookie], host);
foreach (var cookie in cookies)
{
if (responseCookieList.All(c => c.Name != cookie.Name))
{
responseCookies.Add(cookie);
}
}
}
// Handle cookies that are offered
foreach (Cookie responseCookie in responseCookies)
{
var cookieFound = false;
foreach (Cookie existingCookie in cookieJar.GetCookies(webRequest.Destination))
{
if (responseCookie.Name.Equals(existingCookie.Name))
{
existingCookie.Value = responseCookie.Value;
cookieFound = true;
}
}
if (!cookieFound)
{
var args = new AddingCookieEventArgs(responseCookie);
OnAddingCookie(args);
if (!args.Cancel)
{
// .NET Core seems to enforce the fact that the cookie domain _must_ start with a dot,
// so let's make sure that's the case.
if (!string.IsNullOrEmpty(responseCookie.Domain) && !responseCookie.Domain.StartsWith("."))
{
responseCookie.Domain = "." + responseCookie.Domain;
}
string url = responseCookie.Secure ? "https://" : "http://";
url += responseCookie.Domain.Substring(1);
var uri = new Uri(url);
cookieJar.Add(uri, responseCookie);
}
}
}
if (redirectionStatusCodes.Contains(webResponse.StatusCode))
{
// We have a redirected response, so get the new location.
var location = webResponse.Headers[CommonHeaders.Location];
// Locations should always be absolute, per the RFC (http://tools.ietf.org/html/rfc2616#section-14.30), but
// that won't always be the case.
Uri redirectUri;
if (Uri.IsWellFormedUriString(location, UriKind.Absolute))
{
redirectUri = new Uri(location);
}
else
{
redirectUri = new Uri(webRequest.Destination, new Uri(location, UriKind.Relative));
}
if (webRequest.AutoRedirect)
{
// Dispose webResponse before auto redirect, otherwise the connection will not be closed until all the auto redirect finished.
// http://www.wadewegner.com/2007/08/systemnetwebexception-when-issuing-more-than-two-concurrent-webrequests/
webResponse.Dispose();
// We are auto redirecting, so make a recursive call to perform the redirect by hand.
response = SendRequest(new GetWebRequest(redirectUri));
}
else
{
var responseUri = webResponse.ResponseUri;
webResponse.Dispose();
// We are not auto redirecting, so send the caller a redirect response.
response = new RedirectedWebResponse(responseUri, webRequest, redirectUri);
}
}
else
{
// We have a non-redirected response.
response = WebResponseFactory.CreateResponse(webResponse);
if (response.ResponseType == WebResponseType.Html)
{
// We have an HTML response, so check for an old school Meta refresh tag
var metaRefreshUrl = GetMetaRefreshUrl((( HtmlWebResponse )response).Html);
if (!string.IsNullOrWhiteSpace(metaRefreshUrl))
{
// The page has a Meta refresh tag, so build the redirect URL
var redirectUri = new Uri(response.ResponseUrl, metaRefreshUrl);
if (webRequest.AutoRedirect)
{
// Dispose webResponse before auto redirect, otherwise the connection will not be closed until all the auto redirect finished.
// http://www.wadewegner.com/2007/08/systemnetwebexception-when-issuing-more-than-two-concurrent-webrequests/
response.Dispose();
// We are auto redirecting, so make a recursive call to perform the redirect
response = SendRequest(new GetWebRequest(redirectUri, httpWebRequest.AllowAutoRedirect));
}
else
{
var responseUrl = response.ResponseUrl;
response.Dispose();
// We are not auto redirecting, so send the caller a redirect response
response = new RedirectedWebResponse(responseUrl, webRequest, redirectUri);
}
}
}
}
}
else
{
response = new ExceptionWebResponse(webRequest.Destination, new WebException(Properties.Resources.NoResponse));
webResponse.Dispose();
}
}
catch (WebException ex) {
response = new ExceptionWebResponse(webRequest.Destination, ex);
webResponse?.Dispose();
}
return(response);
}
