Append data to a POST NSURLRequest

Question

How do you append data to an existing POST NSURLRequest  I need to add a new parameter userId 2323

User · Answer

NSURL  url   NSURL URLWithString   https   www paypal com cgi-bin webscr     NSMutableURLRequest  request    NSMutableURLRequest requestWithURL aUrl                                                         cachePolicy NSURLRequestUseProtocolCachePolicy                                                     timeoutInterval 10 0    request setHTTPMethod   POST     NSString  postString     userId 2323    request setHTTPBody  postString dataUsingEncoding NSUTF8StringEncoding

User · Answer

All the changes to the NSMutableURLRequest must be made before calling NSURLConnection   I see this problem as I copy and paste the code above and run TCPMon and see the request is GET instead of the expected POST   NSURL  aUrl    NSURL URLWithString   http   www apple com     NSMutableURLRequest  request    NSMutableURLRequest requestWithURL aUrl                                      cachePolicy NSURLRequestUseProtocolCachePolicy                                  timeoutInterval 60 0      request setHTTPMethod   POST    NSString  postString     company Locassa amp quality AWESOME     request setHTTPBody  postString dataUsingEncoding NSUTF8StringEncoding     NSURLConnection  connection    NSURLConnection alloc  initWithRequest request                                                           delegate self

User · Answer

The example code above was really helpful to me  however  as has been hinted at above   I think you need to use NSMutableURLRequest rather than NSURLRequest   In its current form  I couldn t get it to respond to the setHTTPMethod call  Changing the type fixed things right up

User · Answer

Any one looking for a swift solution   let url   NSURL string   http   www apple com    let request   NSMutableURLRequest URL  url   request HTTPBody    company Locassa amp quality AWESOME   dataUsingEncoding NSUTF8StringEncoding

User · Answer

If you don t wish to use 3rd party classes then the following is how you set the post body     NSURL  aUrl    NSURL URLWithString   http   www apple com     NSMutableURLRequest  request    NSMutableURLRequest requestWithURL aUrl                                          cachePolicy NSURLRequestUseProtocolCachePolicy                                      timeoutInterval 60 0     request setHTTPMethod   POST    NSString  postString     company Locassa amp quality AWESOME     request setHTTPBody  postString dataUsingEncoding NSUTF8StringEncoding     NSURLConnection  connection    NSURLConnection alloc  initWithRequest request                                                               delegate self     Simply append your key value pair to the post string

User · Answer

The previous posts about forming POST requests are largely correct  add the parameters to the body  not the URL   But if there is any chance of the input data containing any reserved characters  e g  spaces  ampersand  plus sign   then you will want to handle these reserved characters  Namely  you should percent-escape the input     create body of the request  NSString  userid       NSString  encodedUserid    self percentEscapeString userid   NSString  postString       NSString stringWithFormat   userid      encodedUserid   NSData    postBody         postString dataUsingEncoding NSUTF8StringEncoding      initialize a request from url  NSMutableURLRequest  request    NSMutableURLRequest requestWithURL url    request setHTTPBody postBody    request setHTTPMethod   POST     request setValue   application x-www-form-urlencoded  forHTTPHeaderField   Content-Type       initialize a connection from request  any way you want to  e g   NSURLConnection  connection     NSURLConnection alloc  initWithRequest request delegate self     Where the precentEscapeString method is defined as follows   -  NSString   percentEscapeString  NSString   string       NSString  result   CFBridgingRelease CFURLCreateStringByAddingPercentEscapes kCFAllocatorDefault                                                                                    CFStringRef string                                                                                    CFStringRef                                                                                         CFStringRef          amp                                                                                             kCFStringEncodingUTF8        return  result stringByReplacingOccurrencesOfString      withString            Note  there was a promising NSString method  stringByAddingPercentEscapesUsingEncoding  now deprecated   that does something very similar  but resist the temptation to use that  It handles some characters  e g  the space character   but not some of the others  e g  the   or  amp  characters    The contemporary equivalent is stringByAddingPercentEncodingWithAllowedCharacters  but  again  don t be tempted to use URLQueryAllowedCharacterSet  as that also allows   and  amp  pass unescaped  Those two characters are permitted within the broader  query   but if those characters appear within a value within a query  they must escaped  Technically  you can either use URLQueryAllowedCharacterSet to build a mutable character set and remove a few of the characters that they ve included in there  or build your own character set from scratch   For example  if you look at Alamofire s parameter encoding  they take URLQueryAllowedCharacterSet and then remove generalDelimitersToEncode  which includes the characters          and    but because of a historical bug in some old web servers  neither   nor    and subDelimitersToEncode  i e         amp                        and     This is correct implementation  though you could debate the removal of   and     though pretty convoluted  Perhaps CFURLCreateStringByAddingPercentEscapes is more direct efficient

[ios] Append data to a POST NSURLRequest

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