//end of switch
/// <exception cref="Apache.Http.ProtocolException"></exception>
public virtual URI GetLocationURI(IHttpRequest request, HttpResponse response, HttpContext
context)
{
Args.NotNull(request, "HTTP request");
Args.NotNull(response, "HTTP response");
Args.NotNull(context, "HTTP context");
HttpClientContext clientContext = ((HttpClientContext)HttpClientContext.Adapt(context
));
//get the location header to find out where to redirect to
Header locationHeader = response.GetFirstHeader("location");
if (locationHeader == null)
{
// got a redirect response, but no location header
throw new ProtocolException("Received redirect response " + response.GetStatusLine
() + " but no location header");
}
string location = locationHeader.GetValue();
if (this.log.IsDebugEnabled())
{
this.log.Debug("Redirect requested to location '" + location + "'");
}
RequestConfig config = clientContext.GetRequestConfig();
URI uri = CreateLocationURI(location);
// rfc2616 demands the location value be a complete URI
// Location = "Location" ":" absoluteURI
try
{
if (!uri.IsAbsolute())
{
if (!config.IsRelativeRedirectsAllowed())
{
throw new ProtocolException("Relative redirect location '" + uri + "' not allowed"
);
}
// Adjust location URI
HttpHost target = clientContext.GetTargetHost();
Asserts.NotNull(target, "Target host");
URI requestURI = new URI(request.GetRequestLine().GetUri());
URI absoluteRequestURI = URIUtils.RewriteURI(requestURI, target, false);
uri = URIUtils.Resolve(absoluteRequestURI, uri);
}
}
catch (URISyntaxException ex)
{
throw new ProtocolException(ex.Message, ex);
}
RedirectLocations redirectLocations = (RedirectLocations)clientContext.GetAttribute
(HttpClientContext.RedirectLocations);
if (redirectLocations == null)
{
redirectLocations = new RedirectLocations();
context.SetAttribute(HttpClientContext.RedirectLocations, redirectLocations);
}
if (!config.IsCircularRedirectsAllowed())
{
if (redirectLocations.Contains(uri))
{
throw new CircularRedirectException("Circular redirect to '" + uri + "'");
}
}
redirectLocations.Add(uri);
return(uri);
}