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Resolved How to calculate "Content-Length" while consuming a POST REST call

  1. How-to
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  1. VISHALAKSHI RAO
    VISHALAKSHI RAO
  2. PowerBuilder
  3. Thursday, 14 July 2022 17:20 PM UTC

Hi,

How do we calculate "Content-Length" while consuming a POST REST call in PowerBuilder 2019 version? I have used LEN function to check the length of the body. But its not working. I have attached PB code for it. Could you please suggest a solution to this?

 

Regards,

Vishalakshi

ls_email = "abc@gmail.com"
ls_password = "1234"
ls_body = "email= " + ls_email + "&" + "password= " + ls_password
ls_url = "https://XXX/login/authenticate"

lnv_RestClient = CREATE RestClient
lnv_package = CREATE JsonPackage

ls_content_length = String(Len(ls_body))  //This is not giving the required data

lnv_RestClient.SetRequestHeader( "Content-Type","application/x-www-form-urlencoded")
lnv_RestClient.SetRequestHeader( "Host", "maven.gscmaven.com")
lnv_RestClient.SetRequestHeader( "Content-Length", ls_content_length)
	
li_rc = lnv_RestClient.SendPostRequest(ls_url, ls_body, ls_response)
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Accepted Answer
Arnd Schmidt
Arnd Schmidt Accepted Answer Pending Moderation
  1. Thursday, 14 July 2022 22:39 PM UTC
  2. PowerBuilder
  3. # Permalink

How about removing the space after the '=' sign  to send proper key=value pairs?


ls_body = "email=" + ls_email + "&" + "password=" + ls_password

Also Keep in mind that for special characters UTF-8 uses a multibyte representation - so you have to set the length in bytes (aka octets) in the request header.

hth

Arnd

 

Comment
VISHALAKSHI RAO
  1. VISHALAKSHI RAO
  2. Friday, 15 July 2022 00:08 AM UTC
HI Arnd,

Thank you. This solution worked! So, the problem was with Space, not on "Content-Length". Thank you very much for suggesting!
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Responses (3)
Miguel Leeuwe
Miguel Leeuwe Accepted Answer Pending Moderation
  1. Thursday, 14 July 2022 18:15 PM UTC
  2. PowerBuilder
  3. # 1

Please describe "is not working".

Is the result of 

ls_content_length = String(Len(ls_body))

not working? 

Or is your subsequent call to 

lnv_RestClient.SetRequestHeader( "Content-Length", ls_content_length)
	
li_rc = lnv_RestClient.SendPostRequest(ls_url, ls_body, ls_response)

not working given the length in the setrequestheader ?

 

regards.

MiguelL

Comment
VISHALAKSHI RAO
  1. VISHALAKSHI RAO
  2. Thursday, 14 July 2022 19:52 PM UTC
Hi MiguelL,

Thank you for your response.



For my REST call, "Content-Length" is mandatory input. if I don't include this or pass wrong value, I get "Unauthorized Access" error. I have verified in POSTMAN. I get same error in POSTMAN too, If I don't include this Header. If I include this header in POSTMAN, it works fine. But this header value is calculated automatically in POSTMAN.

So, this CONTENT-LENGTH header is not having the right data & hence unable to make the call



Regards,

Vishalakshi
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Olan Knight
Olan Knight Accepted Answer Pending Moderation
  1. Thursday, 14 July 2022 18:01 PM UTC
  2. PowerBuilder
  3. # 2

 

What is the result you are getting?

If your method is not working, try breaking it down into its components, like this:

ll_len = 0
ll_len = LEN (ls_body)

ls_content_length = STRING (ll_len)

Comment
VISHALAKSHI RAO
  1. VISHALAKSHI RAO
  2. Thursday, 14 July 2022 19:54 PM UTC
Hi Olan,

Thank you for your reply.



I have tried breaking down. But not successful.



For my REST call, "Content-Length" is mandatory input. if I don't include this or pass wrong value, I get "Unauthorized Access" error. I have verified in POSTMAN. I get same error in POSTMAN too, If I don't include this Header. If I include this header in POSTMAN, it works fine. But this header value is calculated automatically in POSTMAN.

So, this CONTENT-LENGTH header is not having the right data & hence unable to make the call



Regards,

Vishalakshi
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