Fix 303 redirect behaviour, add a test for same

@@ -170,7 +170,6 @@ static NSError *ASITooMuchRedirectionError;
 	[requestHeaders setObject:value forKey:header];
 }
 
-
 // This function will be called either just before a request starts, or when postLength is needed, whichever comes first
 // postLength must be set by the time this function is complete
 - (void)buildPostBody
@@ -1022,8 +1021,16 @@ static NSError *ASITooMuchRedirectionError;
 				}
 			}
 			// Do we need to redirect?
-			if ([self shouldRedirect]) {
+			if ([self shouldRedirect] && [responseHeaders valueForKey:@"Location"]) {
 				if ([self responseStatusCode] > 300 && [self responseStatusCode] < 308 && [self responseStatusCode] != 304) {
+					if ([self responseStatusCode] == 303) {
+						[self setRequestMethod:@"GET"];
+						[self setPostBody:nil];
+						[self setPostLength:0];
+						[self setPostBodyFilePath:nil];
+						[self setPostBodyWriteStream:nil];
+						[self setRequestHeaders:nil];
+					}
 					[self setURL:[[NSURL URLWithString:[responseHeaders valueForKey:@"Location"] relativeToURL:[self url]] absoluteURL]];
 					[self setNeedsRedirect:YES];
 				}

@@ -36,4 +36,5 @@
 - (void)testRedirectPreservesSession;
 - (void)testTooMuchRedirection;
 - (void)testRedirectToNewDomain;
+- (void)test303Redirect;
 @end

@@ -667,4 +667,17 @@
 	GHAssertTrue(success,@"Failed to redirect to a different domain");		
 }
 
+// Ensure request method changes to get
+- (void)test303Redirect
+{
+	ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"http://asi/ASIHTTPRequest/tests/redirect_303"]];
+	[request setRequestMethod:@"PUT"];
+	[request appendPostData:[@"Fuzzy" dataUsingEncoding:NSUTF8StringEncoding]];
+	[request start];
+	BOOL success = [[[request url] absoluteString] isEqualToString:@"http://asi/ASIHTTPRequest/tests/request-method"];
+	GHAssertTrue(success,@"Failed to redirect to correct location");
+	success = [[request responseString] isEqualToString:@"GET"];
+	GHAssertTrue(success,@"Failed to use GET on new URL");
+}
+
 @end