/**
* Report and attempt to recover from {@code e}. Returns true if the HTTP engine was replaced and
* the request should be retried. Otherwise the failure is permanent.
*/
private boolean handleFailure(IOException e) throws IOException {
RouteSelector routeSelector = httpEngine.routeSelector;
if (routeSelector != null && httpEngine.connection != null) {
routeSelector.connectFailed(httpEngine.connection, e);
}
OutputStream requestBody = httpEngine.getRequestBody();
boolean canRetryRequestBody =
requestBody == null
|| requestBody instanceof RetryableOutputStream
|| (faultRecoveringRequestBody != null && faultRecoveringRequestBody.isRecoverable());
if (routeSelector == null && httpEngine.connection == null // No connection.
|| routeSelector != null && !routeSelector.hasNext() // No more routes to attempt.
|| !isRecoverable(e)
|| !canRetryRequestBody) {
httpEngineFailure = e;
return false;
}
httpEngine.release(true);
RetryableOutputStream retryableOutputStream =
requestBody instanceof RetryableOutputStream ? (RetryableOutputStream) requestBody : null;
httpEngine = newHttpEngine(method, rawRequestHeaders, null, retryableOutputStream);
httpEngine.routeSelector = routeSelector; // Keep the same routeSelector.
if (faultRecoveringRequestBody != null && faultRecoveringRequestBody.isRecoverable()) {
httpEngine.sendRequest();
faultRecoveringRequestBody.replaceStream(httpEngine.getRequestBody());
}
return true;
}
@Override
public final OutputStream getOutputStream() throws IOException {
connect();
OutputStream out = httpEngine.getRequestBody();
if (out == null) {
throw new ProtocolException("method does not support a request body: " + method);
} else if (httpEngine.hasResponse()) {
throw new ProtocolException("cannot write request body after response has been read");
}
if (faultRecoveringRequestBody == null) {
faultRecoveringRequestBody =
new FaultRecoveringOutputStream(MAX_REPLAY_BUFFER_LENGTH, out) {
@Override
protected OutputStream replacementStream(IOException e) throws IOException {
if (httpEngine.getRequestBody() instanceof AbstractOutputStream
&& ((AbstractOutputStream) httpEngine.getRequestBody()).isClosed()) {
return null; // Don't recover once the underlying stream has been closed.
}
if (handleFailure(e)) {
return httpEngine.getRequestBody();
}
return null; // This is a permanent failure.
}
};
}
return faultRecoveringRequestBody;
}
/**
* Aggressively tries to get the final HTTP response, potentially making many HTTP requests in the
* process in order to cope with redirects and authentication.
*/
private HttpEngine getResponse() throws IOException {
initHttpEngine();
if (httpEngine.hasResponse()) {
return httpEngine;
}
while (true) {
if (!execute(true)) {
continue;
}
Retry retry = processResponseHeaders();
if (retry == Retry.NONE) {
httpEngine.automaticallyReleaseConnectionToPool();
return httpEngine;
}
// The first request was insufficient. Prepare for another...
String retryMethod = method;
OutputStream requestBody = httpEngine.getRequestBody();
// Although RFC 2616 10.3.2 specifies that a HTTP_MOVED_PERM
// redirect should keep the same method, Chrome, Firefox and the
// RI all issue GETs when following any redirect.
int responseCode = getResponseCode();
if (responseCode == HTTP_MULT_CHOICE
|| responseCode == HTTP_MOVED_PERM
|| responseCode == HTTP_MOVED_TEMP
|| responseCode == HTTP_SEE_OTHER) {
retryMethod = "GET";
requestBody = null;
}
if (requestBody != null && !(requestBody instanceof RetryableOutputStream)) {
throw new HttpRetryException(
"Cannot retry streamed HTTP body", httpEngine.getResponseCode());
}
if (retry == Retry.DIFFERENT_CONNECTION) {
httpEngine.automaticallyReleaseConnectionToPool();
}
httpEngine.release(false);
httpEngine =
newHttpEngine(
retryMethod,
rawRequestHeaders,
httpEngine.getConnection(),
(RetryableOutputStream) requestBody);
}
}
@Override
public final OutputStream getOutputStream() throws IOException {
connect();
OutputStream out = httpEngine.getRequestBody();
if (out == null) {
throw new ProtocolException("method does not support a request body: " + method);
} else if (httpEngine.hasResponse()) {
throw new ProtocolException("cannot write request body after response has been read");
}
return out;
}