iPhone sending POST with NSURLConnection

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Your data is wrong. If you expect the data to be found in the $_POST array of PHP, it should look like this:

const char *bytes = "mydata=Hello%20World";

If you want to send XML Data, you need to set a different HTTP Content Type. E.g. you might set

application/xml; charset=utf-8

If you set no HTTP Content Type, the default type

application/x-www-form-urlencoded

will be used. And this type expects the POST data to have the same format as it would have in a GET request.

However, if you set a different HTTP Content Type, like application/xml, then this data is not added to the $_POST array in PHP. You will have to read the raw from the input stream.

Try this:

NSString * str = [NSString stringWithFormat:@"<?xml version=\"1.0\"?>\n<mydata>%@</mydata>", data];
[request setHTTPMethod:@"POST"];
[request setValue:@"application/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:[str dataUsingEncoding:NSUTF8StringEncoding]];

and on the server try the following PHP:

$handle = fopen("php://input", "rb");
$http_raw_post_data="";
while (!feof($handle)) {
    $http_raw_post_data .= fread($handle, 8192);
}
fclose($handle);

Please note that this only works if the HTTP header of your POST is not application/x-www-form-urlencoded. If it is application/x-www-form-urlencoded then PHP itself reads all the post data, decodes it (splitting it into key/value pairs), and finally adds it to the $_POST array.

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