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Re: XMLHttpRequest: POST with Data

Cross-posted to 2 groups.

Followups directed to: microsoft.public.inetserver.asp.general

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On 23/08/2012 23:00, Gene Wirchenko wrote:
> Dear JavaScripters:
>
>       I am trying to pass data back and forth using XMLHttpRequest.  I
> have run into a few issues.  The first one is the most important.
>
>    1) I can not get POST to work according to various documentation I
> have found on the Web.
>
>       Suppposedly, the .open() and .send() would be
>            oRequest.open("POST",Url,true);
>            oRequest.send(DataToSend);
> but with this, at the server end, the .QueryString value is ""
> regardless of what was supposedly sent.
>
>       I have found that using the GET style of
>            oRequest.open("POST",Url+"?"+DataToSend,true);
>            oRequest.send();
> does work.  At least, it appears to.
>
>       Am I doing something wrong, or is the documentation wrong?

As has been indicated, you're looking in the wrong place for the data. 
The query string (.QueryString) is part of the URL used to locate the 
receiving page, hence when you modify the URL in the second example, the 
information is available.

The POST method adds data as a "payload" in the request body sent to the 
server, and this is accessed differently through the Request.Form 
collection[1].

If you're new to authoring server-side and you haven't already, I'd 
suggest that you read RFC 2616, Hypertext Transfer Protocol 
(HTTP/1.1)[2] to be sure you behave properly (especially when sending 
data from the server). You might also want to review Microsoft's 
overview of processing user input in ASP[3]. Though it refers to forms 
throughout, that's irrelevant in this case: the transmission method (GET 
vs. POST) is key.

[snipped encoding question]

Hope that helps,
Mike


Copied and follow-ups set to microsoft.public.inetserver.asp.general
(NB. I don't read this board as I don't use ASP)

[1] <http://msdn.microsoft.com/en-us/library/ms525985(v=vs.90)>
[2] <http://www.w3.org/Protocols/rfc2616/rfc2616.html>
[3] <http://msdn.microsoft.com/en-us/library/ms525182(v=vs.90)>

-- 
Mike Winter
Replace ".invalid" with ".uk" to reply by e-mail.

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Thread

XMLHttpRequest: POST with Data Gene Wirchenko <genew@ocis.net> - 2012-08-23 15:00 -0700
  Re: XMLHttpRequest: POST with Data "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-08-23 22:48 +0000
    Re: XMLHttpRequest: POST with Data Gene Wirchenko <genew@ocis.net> - 2012-08-23 16:40 -0700
      Re: XMLHttpRequest: POST with Data "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2012-08-26 20:39 +0000
  Re: XMLHttpRequest: POST with Data Christoph Becker <cmbecker69@gmx.de> - 2012-08-24 01:11 +0200
    Re: XMLHttpRequest: POST with Data Gene Wirchenko <genew@ocis.net> - 2012-08-23 16:42 -0700
      Re: XMLHttpRequest: POST with Data Christoph Becker <cmbecker69@gmx.de> - 2012-08-24 02:54 +0200
        Re: XMLHttpRequest: POST with Data Gene Wirchenko <genew@ocis.net> - 2012-08-23 19:04 -0700
          Re: XMLHttpRequest: POST with Data Tim Streater <timstreater@greenbee.net> - 2012-08-24 08:57 +0100
    Re: XMLHttpRequest: POST with Data Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-08-25 12:02 +0200
      Re: XMLHttpRequest: POST with Data Christoph Becker <cmbecker69@gmx.de> - 2012-08-25 14:09 +0200
        Re: XMLHttpRequest: POST with Data Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-08-25 15:20 +0200
          Re: XMLHttpRequest: POST with Data Christoph Becker <cmbecker69@gmx.de> - 2012-08-26 15:49 +0200
            Re: XMLHttpRequest: POST with Data Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-08-26 19:15 +0200
              Re: XMLHttpRequest: POST with Data Stefan Weiss <krewecherl@gmail.com> - 2012-08-26 19:54 +0200
                Re: XMLHttpRequest: POST with Data Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-08-26 21:43 +0200
              Re: XMLHttpRequest: POST with Data Christoph Becker <cmbecker69@gmx.de> - 2012-08-26 23:42 +0200
  Re: XMLHttpRequest: POST with Data Denis McMahon <denismfmcmahon@gmail.com> - 2012-08-24 02:55 +0000
  Re: XMLHttpRequest: POST with Data "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2012-08-23 19:28 -0700
  Re: XMLHttpRequest: POST with Data "Tom de Neef" <tdeneef@qolor.nl> - 2012-08-24 15:58 +0200
  Re: XMLHttpRequest: POST with Data Ross McKay <au.org.zeta.at.rosko@invalid.invalid> - 2012-08-26 08:38 +1000
  Re: XMLHttpRequest: POST with Data Mike Winter <usenet@michael-winter.me.invalid> - 2012-08-26 14:59 +0100

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