Removing exception caused by multipartFormRequestWithMethod:path:para…

…meters:constructingBodyWithBlock: is called with certain HTTP methods. Although message bodies for methods like HEAD, GET, and DELETE are traditionally ignored, there is nothing in the HTTP or multipart specs that explicitly forbid the use of multipart for a particular HTTP method.

AFNetworking/AFHTTPClient.m

@@ -235,7 +235,7 @@ - (NSMutableURLRequest *)requestWithMethod:(NSString *)method
     [request setAllHTTPHeaderFields:self.defaultHeaders];
 
     if (parameters) {        
-        if ([method isEqualToString:@"GET"]) {
+        if ([method isEqualToString:@"GET"] || [method isEqualToString:@"HEAD"] || [method isEqualToString:@"DELETE"]) {
             url = [NSURL URLWithString:[[url absoluteString] stringByAppendingFormat:[path rangeOfString:@"?"].location == NSNotFound ? @"?%@" : @"&%@", AFQueryStringFromParametersWithEncoding(parameters, self.stringEncoding)]];
             [request setURL:url];
         } else {
@@ -265,11 +265,6 @@ - (NSMutableURLRequest *)multipartFormRequestWithMethod:(NSString *)method
                                              parameters:(NSDictionary *)parameters
                               constructingBodyWithBlock:(void (^)(id <AFMultipartFormData>formData))block
 {
-    if (!([method isEqualToString:@"POST"] || [method isEqualToString:@"PUT"] || [method isEqualToString:@"DELETE"])) {
-        [NSException raise:@"Invalid HTTP Method" format:@"%@ is not supported for multipart form requests; must be either POST, PUT, or DELETE", method];
-        return nil;
-    }
-
     NSMutableURLRequest *request = [self requestWithMethod:method path:path parameters:nil];
     __block AFMultipartFormData *formData = [[AFMultipartFormData alloc] initWithStringEncoding:self.stringEncoding];