/**
* Returns the retry action to take for the current response headers. The headers, proxy and
* target URL for this connection may be adjusted to prepare for a follow up request.
*/
private Retry processResponseHeaders() throws IOException {
Proxy selectedProxy =
httpEngine.connection != null
? httpEngine.connection.getRoute().getProxy()
: client.getProxy();
final int responseCode = getResponseCode();
switch (responseCode) {
case HTTP_PROXY_AUTH:
if (selectedProxy.type() != Proxy.Type.HTTP) {
throw new ProtocolException("Received HTTP_PROXY_AUTH (407) code while not using proxy");
}
// fall-through
case HTTP_UNAUTHORIZED:
Request successorRequest =
HttpAuthenticator.processAuthHeader(
client.getAuthenticator(), httpEngine.getResponse(), selectedProxy);
if (successorRequest == null) return Retry.NONE;
requestHeaders = successorRequest.getHeaders().newBuilder();
return Retry.SAME_CONNECTION;
case HTTP_MULT_CHOICE:
case HTTP_MOVED_PERM:
case HTTP_MOVED_TEMP:
case HTTP_SEE_OTHER:
case HTTP_TEMP_REDIRECT:
if (!getInstanceFollowRedirects()) {
return Retry.NONE;
}
if (++redirectionCount > MAX_REDIRECTS) {
throw new ProtocolException("Too many redirects: " + redirectionCount);
}
if (responseCode == HTTP_TEMP_REDIRECT && !method.equals("GET") && !method.equals("HEAD")) {
// "If the 307 status code is received in response to a request other than GET or HEAD,
// the user agent MUST NOT automatically redirect the request"
return Retry.NONE;
}
String location = getHeaderField("Location");
if (location == null) {
return Retry.NONE;
}
URL previousUrl = url;
url = new URL(previousUrl, location);
if (!url.getProtocol().equals("https") && !url.getProtocol().equals("http")) {
return Retry.NONE; // Don't follow redirects to unsupported protocols.
}
boolean sameProtocol = previousUrl.getProtocol().equals(url.getProtocol());
if (!sameProtocol && !client.getFollowProtocolRedirects()) {
return Retry.NONE; // This client doesn't follow redirects across protocols.
}
boolean sameHost = previousUrl.getHost().equals(url.getHost());
boolean samePort = getEffectivePort(previousUrl) == getEffectivePort(url);
if (sameHost && samePort && sameProtocol) {
return Retry.SAME_CONNECTION;
} else {
return Retry.DIFFERENT_CONNECTION;
}
default:
return Retry.NONE;
}
}
