Fix logging of HTTP request bodies

[stanislaw]

Critical lines:

if (0 < HTTPBodyDataSize && HTTPBodyDataSize <= (1024 * 100)) {
    requestBodyString = [requestBodyString stringByAppendingString:[[NSString alloc] initWithData:HTTPBodyData encoding:NSUTF8StringEncoding]];
}

else if (HTTPBodyDataSize <= (1024 * 100)) {
    requestBodyString = [requestBodyString stringByAppendingString:@"Request body data is too large to be displayed..."];
}