(SQL Server) Get Size of File on Web Server

Demonstrates how to send a HEAD request to fetch information about a file on a web server, which hopefully includes the Content-Length in the response header.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- 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)
    -- This example assumes the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @http int
    -- Use "Chilkat_9_5_0.Http" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Http', @http OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @resp int
    EXEC sp_OAMethod @http, 'GetHead', @resp OUT, 'https://nodejs.org/dist/v10.16.1/node-v10.16.1-win-x64.zip'
    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

    -- Examine the response header.
    EXEC sp_OAGetProperty @resp, 'Header', @sTmp0 OUT
    PRINT @sTmp0

    -- Here is a sample response header:

    -- Date: Thu, 01 Aug 2019 12:47:27 GMT
    -- Content-Type: application/zip
    -- Content-Length: 17457922
    -- Connection: keep-alive
    -- Set-Cookie: __cfduid=da5b78dcdd8171683c5a578eb9c9f88c81564663647; expires=Fri, 31-Jul-20 12:47:27 GMT; path=/; domain=.nodejs.org; HttpOnly
    -- Last-Modified: Wed, 31 Jul 2019 18:21:57 GMT
    -- ETag: "5d41dc45-10a6302"
    -- Accept-Ranges: bytes
    -- Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
    -- Server: cloudflare
    -- CF-RAY: 4ff7ebb32ac4e1e2-ORD

    -- Get the Content-Length header.
    DECLARE @contentLengthStr nvarchar(4000)
    EXEC sp_OAMethod @resp, 'GetHeaderField', @contentLengthStr OUT, 'Content-Length'
    -- If the header exists...
    EXEC sp_OAGetProperty @resp, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 = 1
      BEGIN

        PRINT 'Content-Length: ' + @contentLengthStr
        -- Your application can convert the contentLengthStr to an integer and then use it....
      END
    EXEC @hr = sp_OADestroy @resp


    EXEC @hr = sp_OADestroy @http


END
GO