/**
* Handle the call and follow redirection for safe methods.
*
* @param request The request to send.
* @param response The response to update.
* @param references The references that caused a redirection to prevent infinite loops.
* @param retryAttempt The number of remaining attempts.
* @param next The next handler handling the call.
*/
private void handle(
Request request,
Response response,
List<Reference> references,
int retryAttempt,
Uniform next) {
if (next != null) {
// Actually handle the call
next.handle(request, response);
// Check for redirections
if (isFollowingRedirects()
&& response.getStatus().isRedirection()
&& (response.getLocationRef() != null)) {
boolean doRedirection = false;
if (request.getMethod().isSafe()) {
doRedirection = true;
} else {
if (Status.REDIRECTION_SEE_OTHER.equals(response.getStatus())) {
// The user agent is redirected using the GET method
request.setMethod(Method.GET);
request.setEntity(null);
doRedirection = true;
} else if (Status.REDIRECTION_USE_PROXY.equals(response.getStatus())) {
doRedirection = true;
}
}
if (doRedirection) {
Reference newTargetRef = response.getLocationRef();
if ((references != null) && references.contains(newTargetRef)) {
getLogger().warning("Infinite redirection loop detected with URI: " + newTargetRef);
} else if (request.getEntity() != null && !request.isEntityAvailable()) {
getLogger()
.warning(
"Unable to follow the redirection because the request entity isn't available anymore.");
} else {
if (references == null) {
references = new ArrayList<Reference>();
}
// Add to the list of redirection reference
// to prevent infinite loops
references.add(request.getResourceRef());
request.setResourceRef(newTargetRef);
handle(request, response, references, 0, next);
}
}
} else if (isRetryOnError()
&& response.getStatus().isRecoverableError()
&& request.getMethod().isIdempotent()
&& (retryAttempt < getRetryAttempts())
&& ((request.getEntity() == null) || request.getEntity().isAvailable())) {
getLogger()
.log(
Level.INFO,
"A recoverable error was detected ("
+ response.getStatus().getCode()
+ "), attempting again in "
+ getRetryDelay()
+ " ms.");
// Wait before attempting again
if (getRetryDelay() > 0) {
try {
Thread.sleep(getRetryDelay());
} catch (InterruptedException e) {
getLogger().log(Level.FINE, "Retry delay sleep was interrupted", e);
}
}
// Retry the call
handle(request, response, references, ++retryAttempt, next);
}
}
}
