/**
* 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);
}
}
/**
* Returns an input stream from the server in the case of error such as the requested file (txt,
* htm, html) is not found on the remote server.
*/
@Override
public final InputStream getErrorStream() {
try {
HttpEngine response = getResponse();
if (response.hasResponseBody() && response.getResponseCode() >= HTTP_BAD_REQUEST) {
return response.getResponseBody();
}
return null;
} catch (IOException e) {
return null;
}
}