Question

Understanding the use of a postback url

Asked by: wfluisi

We have created an ASP page that generates and submits an XML request to a vendor.  the vendor is asking for a postback url to send the resulting XML.  I do not understand what they are asking for.  i have a page, it submits a request, i want to take the result of that request and format something with those results and display it to the user. is the postback url the page that the user will be transferred to next?  

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Asked On
2008-03-06 at 05:41:34ID23219418
Tags

XML, ASP, PHP

,

IE 7 or Firefox 2

Topics

Extensible Markup Language (XML)

,

Active Server Pages (ASP)

,

PHP Scripting Language

Participating Experts
1
Points
500
Comments
5

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Answers

 

by: alorentzPosted on 2008-03-06 at 05:51:10ID: 21060083

Just as the client to clarify.  "postback url" is not common terminology in this case, so you need to ask what they really want if that is what they said.

When sending XML, you send information to a page (vendor page maybe), and you get a response from that page that can contain anything they have on their page.

XML examples:
http://www.4guysfromrolla.com/webtech/110100-1.shtml
http://www.w3schools.com/dom/dom_http.asp

 

by: wfluisiPosted on 2008-03-06 at 06:05:57ID: 21060222

Here is an example...

sSvcURL = "https://xxxx.dummy.com/ProvisionRequestListener.asmx"
sParams = "<?xml version=""1.0"" encoding=""utf-8"" ?>" & _
"<ProvisionRequest  xmlns=""http://dummy.org/ProvisionRequest.xsd"">" & _
"      <Credentials>" & _
"            <Token>userid</Token>" & _
"            <TokenKey>password</TokenKey>" & _
"      </Credentials>" & _
"      <NewService serviceType=""GSM"">" & _
"            <ServiceZip>11111</ServiceZip>" & _
"            <Service>" & _
"                  <Plan>111</Plan>" & _
"                  <Options>" & _
"                        <Option>1</Option>" & _
"                        <Option>2</Option>" & _
"                  </Options>" & _
"            </Service>" & _
"            <Equipment>" & _
"                  <Existing serviceType=""GSM"">" & _
"                        <IMEI SIM=""00000000000000000000"">111111111111111</IMEI>" & _
"                  </Existing>" & _
"            </Equipment>" & _
"      </NewService>      " & _
"</ProvisionRequest>"
sResult = GetPage(sSvcURL, Request_POST, sParams, "", "")

// in this example i submit a zip code, a simp number and some other information
// if i look at the result i get in the sResult data item i see resulting XML
// but, i do not get all of the information i need.  i am told i need to give the vendor
// a url for them to use, then the XML i get back will be the entire result string
// currently all i am getting is an ACK or NACK and sometimes an error message.
//
// now normally i would transfer to another page and display the result (in this case the phone number assigned by the vendor)
// is the postback url just that (the page name i am going to next?) then at the start of that page i just have to find the XML string
// sent back, parse it and display it?
//
// Evertime i ask what a postback url is they say "it's where we send back the results"....  not very helpfull

 

by: alorentzPosted on 2008-03-06 at 06:24:05ID: 21060381

It depends on what they are asking for and the data being transferred.  Postback URL is generally used for .Net.  Here's some information, may be it will help:
http://www.google.com/search?hl=en&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=postbackurl&spell=1

 

by: alorentzPosted on 2008-03-06 at 06:33:22ID: 21060459

It sounds like they expect an independent URL on your server, which they use to send information, in the same way you send it to them.  However, for this to work, you would need to store everything they send back in the database so you can use it on a page on your site.

Your XMLHTTP call to send information is not in the same process as a postback url that they would use.  One happens on your end, and the other on theirs.

Usually, the response you get from them would have all the information you need.  A postback url for them is a different process.

Example:
 1.  You send information to them, including a postback url in the XML you send.
 2.  Your request triggers their page to post back information to your postback url
 3.  On the postback url, you store the information they send back
 4.  Then at the end of you post you redirect to a page that reads the information that came back via the postback url

Presumably you would use some identifier that is exchange in the call to redirect and read the information they sent back from the database.

 

by: wfluisiPosted on 2008-03-06 at 08:35:20ID: 31437228

Thank you, this gives us enough information to finish up..  i should have posted earlier, we would have saved a bunch of time.

20120131-EE-VQP-002

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