@Override
public NetworkResponse performRequest(Request<?> request) throws VolleyError {
long requestStart = SystemClock.elapsedRealtime();
while (true) {
HttpResponse httpResponse = null;
byte[] responseContents = null;
Map<String, String> responseHeaders = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
try {
// Gather headers.
Map<String, String> headers = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
addCacheHeaders(headers, request.getCacheEntry());
httpResponse = mHttpStack.performRequest(request, headers);
responseHeaders.putAll(httpResponse.getAllHeaders());
int statusCode = httpResponse.getResponseCode();
// Handle cache validation.
if (statusCode == HttpResponse.SC_NOT_MODIFIED) {
Entry entry = request.getCacheEntry();
if (entry == null) {
return new NetworkResponse(
HttpResponse.SC_NOT_MODIFIED,
null,
responseHeaders,
true,
SystemClock.elapsedRealtime() - requestStart);
}
// A HTTP 304 response does not have all header fields. We
// have to use the header fields from the cache entry plus
// the new ones from the response.
// http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.5
entry.responseHeaders.putAll(responseHeaders);
return new NetworkResponse(
HttpResponse.SC_NOT_MODIFIED,
entry.data,
entry.responseHeaders,
true,
SystemClock.elapsedRealtime() - requestStart);
}
// Handle moved resources
if (statusCode == HttpResponse.SC_MOVED_PERMANENTLY
|| statusCode == HttpResponse.SC_MOVED_TEMPORARILY) {
String newUrl = responseHeaders.get("Location");
request.setRedirectUrl(newUrl);
}
// Some responses such as 204s do not have content. We must check.
if (httpResponse.getEntity() != null) {
responseContents = entityToBytes(httpResponse.getEntity());
} else {
// Add 0 byte response as a way of honestly representing a
// no-content request.
responseContents = new byte[0];
}
// if the request is slow, log it.
long requestLifetime = SystemClock.elapsedRealtime() - requestStart;
logSlowRequests(requestLifetime, request, responseContents, httpResponse);
if (statusCode < 200 || statusCode > 299) {
throw new IOException();
}
return new NetworkResponse(
statusCode,
responseContents,
responseHeaders,
false,
SystemClock.elapsedRealtime() - requestStart);
} catch (SocketTimeoutException e) {
attemptRetryOnException("socket", request, new TimeoutError());
} catch (ConnectTimeoutException e) {
attemptRetryOnException("connection", request, new TimeoutError());
} catch (MalformedURLException e) {
throw new RuntimeException("Bad URL " + request.getUrl(), e);
} catch (IOException e) {
int statusCode = 0;
NetworkResponse networkResponse = null;
if (httpResponse != null) {
statusCode = httpResponse.getResponseCode();
} else {
throw new NoConnectionError(e);
}
if (statusCode == HttpResponse.SC_MOVED_PERMANENTLY
|| statusCode == HttpResponse.SC_MOVED_TEMPORARILY) {
VolleyLog.e(
"Request at %s has been redirected to %s", request.getOriginUrl(), request.getUrl());
} else {
VolleyLog.e("Unexpected response code %d for %s", statusCode, request.getUrl());
}
if (responseContents != null) {
networkResponse =
new NetworkResponse(
statusCode,
responseContents,
responseHeaders,
false,
SystemClock.elapsedRealtime() - requestStart);
if (statusCode == HttpResponse.SC_UNAUTHORIZED
|| statusCode == HttpResponse.SC_FORBIDDEN) {
attemptRetryOnException("auth", request, new AuthFailureError(networkResponse));
} else if (statusCode == HttpResponse.SC_MOVED_PERMANENTLY
|| statusCode == HttpResponse.SC_MOVED_TEMPORARILY) {
attemptRetryOnException("redirect", request, new RedirectError(networkResponse));
} else {
// TODO: Only throw ServerError for 5xx status codes.
throw new ServerError(networkResponse);
}
} else {
throw new NetworkError(e);
}
}
}
}
