/** Invoked by the HTTPClient. */
public int responsePhase2Handler(Response resp, Request req) throws IOException {
/* handle various response status codes until satisfied */
int sts = resp.getStatusCode();
switch (sts) {
case 302: // General (temporary) Redirection (handle like 303)
/*
* Note we only do this munging for POST and PUT. For GET it's not
* necessary; for HEAD we probably want to do another HEAD. For all
* others (i.e. methods from WebDAV, IPP, etc) it's somewhat unclear -
* servers supporting those should really return a 307 or 303, but some
* don't (guess who...), so we just don't touch those.
*/
if (req.getMethod().equals("POST") || req.getMethod().equals("PUT")) {
if (LOG.isDebugEnabled())
LOG.debug(
"Received status: " + sts + " " + resp.getReasonLine() + " - treating as 303");
sts = 303;
}
case 301: // Moved Permanently
case 303: // See Other (use GET)
case 307: // Moved Temporarily (we mean it!)
if (LOG.isDebugEnabled()) LOG.debug("Handling status: " + sts + " " + resp.getReasonLine());
// the spec says automatic redirection may only be done if
// the second request is a HEAD or GET.
if (!req.getMethod().equals("GET") && !req.getMethod().equals("HEAD") && sts != 303) {
if (LOG.isDebugEnabled())
LOG.debug("Not redirected because method is neither HEAD nor GET");
if (sts == 301 && resp.getHeader("Location") != null)
update_perm_redir_list(req, resLocHdr(resp.getHeader("Location"), req));
resp.setEffectiveURI(lastURI);
return RSP_CONTINUE;
}
case 305: // Use Proxy
case 306: // Switch Proxy
if (sts == 305 || sts == 306) {
if (LOG.isDebugEnabled())
LOG.debug("Handling status: " + sts + " " + resp.getReasonLine());
}
// Don't accept 305 from a proxy
if (sts == 305 && req.getConnection().getProxyHost() != null) {
if (LOG.isDebugEnabled()) LOG.debug("305 ignored because a proxy is already in use");
resp.setEffectiveURI(lastURI);
return RSP_CONTINUE;
}
/*
* the level is a primitive way of preventing infinite redirections.
* RFC-2068 set the max to 5, but RFC-2616 has loosened this. Since some
* sites (notably M$) need more levels, this is now set to the
* (arbitrary) value of 15 (god only knows why they need to do even 5
* redirections...).
*/
if (level >= 15 || resp.getHeader("Location") == null) {
if (LOG.isDebugEnabled()) {
if (level >= 15) LOG.debug("Not redirected because of too many levels of redirection");
else LOG.debug("Not redirected because no Location header was present");
}
resp.setEffectiveURI(lastURI);
return RSP_CONTINUE;
}
level++;
URI loc = resLocHdr(resp.getHeader("Location"), req);
HTTPConnection mvd;
String nres;
new_con = false;
if (sts == 305) {
mvd =
new HTTPConnection(
req.getConnection().getProtocol(),
req.getConnection().getHost(),
req.getConnection().getPort());
mvd.setCurrentProxy(loc.getHost(), loc.getPort());
mvd.setContext(req.getConnection().getContext());
new_con = true;
nres = req.getRequestURI();
/*
* There was some discussion about this, and especially Foteos
* Macrides (Lynx) said a 305 should also imply a change to GET (for
* security reasons) - see the thread starting at
* http://www.ics.uci.edu/pub/ietf/http/hypermail/1997q4/0351.html
* However, this is not in the latest draft, but since I agree with
* Foteos we do it anyway...
*/
req.setMethod("GET");
req.setData(null);
req.setStream(null);
} else if (sts == 306) {
// We'll have to wait for Josh to create a new spec here.
return RSP_CONTINUE;
} else {
if (req.getConnection().isCompatibleWith(loc)) {
mvd = req.getConnection();
nres = loc.getPathAndQuery();
} else {
try {
mvd = new HTTPConnection(loc);
nres = loc.getPathAndQuery();
} catch (ProtocolNotSuppException e) {
if (req.getConnection().getProxyHost() == null
|| !loc.getScheme().equalsIgnoreCase("ftp")) return RSP_CONTINUE;
// We're using a proxy and the protocol is ftp -
// maybe the proxy will also proxy ftp...
mvd =
new HTTPConnection(
"http",
req.getConnection().getProxyHost(),
req.getConnection().getProxyPort());
mvd.setCurrentProxy(null, 0);
nres = loc.toExternalForm();
}
mvd.setContext(req.getConnection().getContext());
new_con = true;
}
/*
* copy query if present in old url but not in new url. This isn't
* strictly conforming, but some scripts fail to propagate the query
* properly to the Location header. See comment on line 126. String
* oquery = Util.getQuery(req.getRequestURI()), nquery =
* Util.getQuery(nres); if (nquery == null && oquery != null) nres +=
* "?" + oquery;
*/
if (sts == 303) {
// 303 means "use GET"
if (!req.getMethod().equals("HEAD")) req.setMethod("GET");
req.setData(null);
req.setStream(null);
} else {
// If they used an output stream then they'll have
// to do the resend themselves
if (req.getStream() != null) {
if (!HTTPConnection.deferStreamed) {
if (LOG.isDebugEnabled())
LOG.debug("Status " + sts + " not handled - request has an output stream");
return RSP_CONTINUE;
}
saved_req = (Request) req.clone();
deferred_redir_list.put(req.getStream(), this);
req.getStream().reset();
resp.setRetryRequest(true);
}
if (sts == 301) {
// update permanent redirection list
try {
update_perm_redir_list(req, new URI(loc, nres));
} catch (ParseException pe) {
throw new Error(
"HTTPClient Internal Error: " + "unexpected exception '" + pe + "'", pe);
}
}
}
// Adjust Referer, if present
NVPair[] hdrs = req.getHeaders();
for (int idx = 0; idx < hdrs.length; idx++)
if (hdrs[idx].getName().equalsIgnoreCase("Referer")) {
HTTPConnection con = req.getConnection();
hdrs[idx] = new NVPair("Referer", con + req.getRequestURI());
break;
}
}
req.setConnection(mvd);
req.setRequestURI(nres);
try {
resp.getInputStream().close();
} catch (IOException ioe) {
if (LOG.isTraceEnabled()) {
LOG.trace("An exception occurred: " + ioe.getMessage());
}
}
if (sts != 305 && sts != 306) {
try {
lastURI = new URI(loc, nres);
} catch (ParseException pe) {
if (LOG.isTraceEnabled()) {
LOG.trace("An exception occurred: " + pe.getMessage());
}
}
if (LOG.isDebugEnabled())
LOG.debug(
"Request redirected to "
+ lastURI.toExternalForm()
+ " using method "
+ req.getMethod());
} else {
if (LOG.isDebugEnabled())
LOG.debug(
"Resending request using "
+ "proxy "
+ mvd.getProxyHost()
+ ":"
+ mvd.getProxyPort());
}
if (req.getStream() != null) return RSP_CONTINUE;
else if (new_con) return RSP_NEWCON_REQ;
else return RSP_REQUEST;
default:
return RSP_CONTINUE;
}
}
