Empty body in POST in ASIHTTPRequest

Question

Basically, I am sending a POST request with an empty data body:

  ASIHTTPRequest *request [ASIHTTPRequest alloc] init];
  [request setURL:[NSURL URLWithString:escapedUrlString]];
  [request setRequestMethod:@"POST"];
  [request addRequestHeader:@"Content-Type" value:@"application/xml"];
  [request startSynchronous];

But i am getting this response each time:

Incorrect NSStringEncoding value 0x0000 detected. Assuming NSStringEncodingASCII. Will stop this compatiblity mapping behavior in the near future.

I am wondering if it's mandatory to set post values.

score 9 · Accepted Answer · answered Dec 05 '10 at 00:06

I don't have much experience with the ASIHTTPRequest wrapper but I can see you are initialising it with alloc:init whilst most examples I've seen have a convenience initialiser requestWithURL:(NSURL*)url i.e.

ASIHTTPRequest *request = [AIHTTPRequest requestWithURL:escapedUrlString];

At a guess I'd say this convenience initaliser will also set some of the required variables for your post request to work, including NSStringEnconding.

From the ASIHTTPRequest documentation at http://allseeing-i.com/ASIHTTPRequest/How-to-use#handling_text_encodings

Handling text encodings

ASIHTTPRequest will attempt to read the text encoding of the received data from the Content-Type header. If it finds a text encoding, it will set responseEncoding to the appropriate NSStringEncoding. If it does not find a text encoding in the header, it will use the value of defaultResponseEncoding (this defaults to NSISOLatin1StringEncoding).

When you call [request responseString], ASIHTTPRequest will attempt to create a string from the data it received, using responseEncoding as the source encoding.

Just to confirm after quickly reviewing the code, this is in fact the case. Check the interface file (ASIHTTPRequest.h) for details on init/dealloc methods. — Rog, Dec 05 '10 at 00:10

score 3 · Answer 2 · answered Jul 15 '11 at 10:14

As Rog says, use initWithURL or requestWithURL. Anyway, in my case the problem was that I was connecting to a slow server and the request timed out giving the "Incorrect NSStringEncoding value 0x0000 detected" error.

I solved it with:

request.timeOutSeconds = 50;

You can try with more than 50 second if your server is even slower.

Empty body in POST in ASIHTTPRequest

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