if (response == null) {
throw new IllegalArgumentException("HTTP response may not be null");
}
//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 + "'");
}
URI uri;
try {
uri = new URI(location);
} catch (URISyntaxException ex) {
throw new ProtocolException("Invalid redirect URI: " + location, ex);
}
HttpParams params = response.getParams();
// rfc2616 demands the location value be a complete URI
// Location = "Location" ":" absoluteURI
if (!uri.isAbsolute()) {
if (params.isParameterTrue(ClientPNames.REJECT_RELATIVE_REDIRECT)) {
throw new ProtocolException("Relative redirect location '"
+ uri + "' not allowed");
}
// Adjust location URI
HttpHost target = (HttpHost) context.getAttribute(
ExecutionContext.HTTP_TARGET_HOST);
if (target == null) {
throw new IllegalStateException("Target host not available " +
"in the HTTP context");
}
HttpRequest request = (HttpRequest) context.getAttribute(
ExecutionContext.HTTP_REQUEST);
try {
URI requestURI = new URI(request.getRequestLine().getUri());
URI absoluteRequestURI = URIUtils.rewriteURI(requestURI, target, true);
uri = URIUtils.resolve(absoluteRequestURI, uri);
} catch (URISyntaxException ex) {
throw new ProtocolException(ex.getMessage(), ex);
}
}
if (params.isParameterFalse(ClientPNames.ALLOW_CIRCULAR_REDIRECTS)) {
RedirectLocations redirectLocations = (RedirectLocations) context.getAttribute(
REDIRECT_LOCATIONS);
if (redirectLocations == null) {
redirectLocations = new RedirectLocations();
context.setAttribute(REDIRECT_LOCATIONS, redirectLocations);
}
URI redirectURI;
if (uri.getFragment() != null) {
try {
HttpHost target = new HttpHost(
uri.getHost(),
uri.getPort(),
uri.getScheme());
redirectURI = URIUtils.rewriteURI(uri, target, true);
} catch (URISyntaxException ex) {
throw new ProtocolException(ex.getMessage(), ex);
}
} else {
redirectURI = uri;
}
if (redirectLocations.contains(redirectURI)) {
throw new CircularRedirectException("Circular redirect to '" +
redirectURI + "'");
} else {
redirectLocations.add(redirectURI);
}
}
return uri;
