retrieving header values of web client function

I am consuming external webservices from my SQL-Anywhere 17 and I am interested in the HTTPSTATUS of the response more than the body itself, so I want just to check if the call to the webservice has succeeded (i.e. whether I got 200 OK as HTTP Status)!

I tried to write something like this, but I get always an empty string in my @ResponseStatus variable!

create or replace function UpdateAPI(EndPoint varchar(200), UserName varchar(200), PWD varchar(200), PayLoad long varchar)

returns long varchar

url 'http://!UserName:!PWD@!EndPoint'

type 'http:put:application/json';

begin

declare @ResponseBody long varchar;

declare @ResponseStatus long varchar;

set @ResponseBody = WC_UpdateAPI(@Endpoint, @username, @pwd, @PayLoad);
set @ResponseStatus = HTTP_RESPONSE_HEADER('@HttpStatus');

select @ResponseBody, @ResponseStatus;
end;

On the other side, I can see this HTTP Response in the WebClientLogFile (as HTTP/1.0 200 OK).

Could please somebody tell me Where I am doing mistake?

webclient

asked 05 May '20, 04:30

Baron
2.1k●136●149●177
accept rate: 48%

edited 05 May '20, 04:30

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One Answer:

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You need to use a web client procedure (instead of a web client function) to have access to the full response, web client functions just return the response's body.

See here and here for details.

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answered 05 May '20, 04:46

Volker Barth
40.2k●361●549●822
accept rate: 34%

edited 05 May '20, 04:48

Thank you very much. It has worked even with the parameter substitution

(05 May '20, 07:42) Baron

Replies hidden

One more question, how can I then get both "body" and "Status" using one single call?

In the mentioned example how can I merge those both calls in one call:

SELECT "value" FROM SAPWebPage() WITH (Attribute LONG VARCHAR, Value LONG VARCHAR, Instance INT) WHERE Attribute = 'Status';

SELECT "value" FROM SAPWebPage() WITH (Attribute LONG VARCHAR, Value LONG VARCHAR, Instance INT) WHERE Attribute = 'body';

(05 May '20, 07:56) Baron

You mean, get those values

as two columns within one row or
within two rows?

For the 1. you can use a PIVOT clause:

SELECT "'Status'" AS STATUS, "'Body'" AS Body
FROM
   (SELECT "attribute", "value"
    FROM SAPWebPage() 
       WITH (Attribute LONG VARCHAR, Value LONG VARCHAR, Instance INT)) ST
   PIVOT (min("value") FOR "attribute" in ('Status', 'Body')) PT

For the second, you would obviously just do something like:

SELECT "attribute", "value"
FROM SAPWebPage() 
   WITH (Attribute LONG VARCHAR, Value LONG VARCHAR, Instance INT)
WHERE "attribute" in ('Status', 'Body')

(05 May '20, 08:07) Volker Barth

Thanks, I was meaning the first one (with this MAGIC Clause PIVOT)

¯_(ツ)_/¯

(05 May '20, 08:36) Baron

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webclient ×48

question asked: 05 May '20, 04:30

question was seen: 875 times

last updated: 05 May '20, 08:39

SAP SQL Anywhere

retrieving header values of web client function

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