SQL Server

Http Follow Redirects

See more HTTP Examples

Demonstrates how to automatically follow redirects. SQL Server

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @http int
    EXEC @hr = sp_OACreate 'Chilkat.Http', @http OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- If you would like to see the HTTP session log to see how 
    -- HTTP redirects were followed.
    EXEC sp_OASetProperty @http, 'SessionLogFilename', 'c:/temp/qa_output/sessionLog.txt'

    -- Run the test using this URL.
    -- (Works while httpbin.org keeps the test endpoint available.)

    DECLARE @url nvarchar(4000)
    SELECT @url = 'https://httpbin.org/redirect-to?url={$redirectUrl}&status_code={$statusCode}'

    DECLARE @success int
    EXEC sp_OAMethod @http, 'SetUrlVar', @success OUT, 'redirectUrl', 'https://chilkatsoft.com/helloWorld.json'
    EXEC sp_OAMethod @http, 'SetUrlVar', @success OUT, 'statusCode', '302'

    DECLARE @jsonResponse nvarchar(4000)
    EXEC sp_OAMethod @http, 'QuickGetStr', @jsonResponse OUT, @url
    EXEC sp_OAGetProperty @http, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 = 0
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        RETURN
      END


    EXEC sp_OAGetProperty @http, 'LastStatus', @iTmp0 OUT
    PRINT 'Response status code: ' + @iTmp0

    PRINT @jsonResponse

    -- How to tell if the request was redirected, and if so,
    -- what was the final redirect URL?

    EXEC sp_OAGetProperty @http, 'WasRedirected', @iTmp0 OUT
    PRINT 'Was Redirected: ' + @iTmp0

    EXEC sp_OAGetProperty @http, 'FinalRedirectUrl', @sTmp0 OUT
    PRINT 'Final Redirect URL: ' + @sTmp0

    -- Output:

    -- Response status code: 200
    -- { "hello": "world" }
    -- Was Redirected: True
    -- Final Redirect URL: https://chilkatsoft.com/helloWorld.json

    -- -----------------------------------------------
    -- Here are the contents of the sessionLog.txt

    -- ---- Sending Sat, 30 Aug 2025 11:41:37 GMT ----
    -- GET /redirect-to?url=https%3A%2F%2Fchilkatsoft.com%2FhelloWorld.json&status_code=302 HTTP/1.1
    -- Host: httpbin.org
    -- Accept: */*
    -- Accept-Encoding: gzip
    -- 
    -- 
    -- ---- Received Sat, 30 Aug 2025 11:41:37 GMT ----
    -- HTTP/1.1 302 FOUND
    -- Date: Sat, 30 Aug 2025 11:41:38 GMT
    -- Content-Type: text/html; charset=utf-8
    -- Content-Length: 0
    -- Connection: keep-alive
    -- Server: gunicorn/19.9.0
    -- Location: https://chilkatsoft.com/helloWorld.json
    -- Access-Control-Allow-Origin: *
    -- Access-Control-Allow-Credentials: true
    -- 
    -- 
    -- ---- Sending Sat, 30 Aug 2025 11:41:38 GMT ----
    -- GET /helloWorld.json HTTP/1.1
    -- Host: chilkatsoft.com
    -- Accept: */*
    -- Accept-Encoding: gzip
    -- 
    -- 
    -- ---- Received Sat, 30 Aug 2025 11:41:38 GMT ----
    -- HTTP/1.1 200 OK
    -- Content-Type: application/json
    -- Last-Modified: Sun, 20 Aug 2023 11:36:27 GMT
    -- Accept-Ranges: bytes
    -- ETag: "34c27f8e5ad3d91:0"
    -- Server: Microsoft-IIS/10.0
    -- X-Powered-By: ASP.NET
    -- Date: Sat, 30 Aug 2025 11:41:38 GMT
    -- Content-Length: 22
    -- 
    -- { "hello": "world" }

    EXEC @hr = sp_OADestroy @http


END
GO