Simple ASIHTTPRequest-based function seems to hang at upload

I've recently started trying to implement HTTP upload support to a program, but I've been having some difficulty doing so. This is the first time I've ever used objective-c (although I have a C background), so I'm still very new to the language. I've been trying to get it to work using the HTTPRequest library, but haven't been able to get anything to start working. It's a fairly large program (2500~ lines) so I won't paste it here. I'll just paste the function itself here.

- (void)Upload2HTTP2:(NSString *)ZipPath
{
        [self UpdateProgressBar:@"Upload2HTTP opening Connection to Website..."];
        NSLog(@"Upload2HTTP called\n");

        //URL to be used to upload
        NSURL *url =  [NSURL URLWithString:@"http://ftp.website.com"];
        NSLog(@"Upload2HTTP -%@\n",url);

        //Creates the new ASIFormDataRequest object to do the uploading
        //Uses the ASIHTTPRequest and ASIFormDataRequest libraries
        // http://allseeing-i.com/ASIHTTPRequest/ for more information
        ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:url];
        [request addRequestHeader:@"Referer" value:@"http://ftp.website.com"];

        //Sets the authentication information
        //This should have already been retrieved in RetrieveFromBrowser
        [request setUsername:RespUID];
        [request setPassword:RespPWD];

        //Sets the file to be uploaded
        [request setFile:ZipPath forKey:@"Customer Upload"];

        //Starts the transfer?
        [request startAsynchronous];


}

ZipPath, RespUID, and RespPWD are all set in another area of the program. Basically, I've got the username/PW for the HTTP authentication, and the path to the开发者_StackOverflow file I want to upload, but I've very little experience with the language and this library, so I'm a bit lost. I can't give any specific errors or reasons as to why it hangs, I just know that after I click upload in the program, it runs through this function, and the program hangs trying to upload the file. Is there anything I'm missing or doing wrong in this function? I'd really appreciate any help you guys could lend.

Thanks :)

ASIHTTPRequest's asynchronous networking takes advantage of the delegate design pattern. Setting the request's delegate property to self, having that class adhere to the ASIHTTPRequestDelegate protocol, and implementing - (void)requestDidFinish: and - (void)requestdidFail: should give you callbacks for finish and failure. Quick example:

- (void)Upload2HTTP2:(NSString *)ZipPath
{
   ...
   request.delegate = self;
   [request startAsynchronous];
}

- (void)requestDidFinish:(ASIHTTPRequest *)request
{
   NSLog(@"Success! Do stuff here with [request responseData] or [request responseString]");
}

- (void)requestDidFail:(ASIHTTPRequest *)request
{
   NSLog(@"Failure! Check out [request error] for details");
}