Re: Perform a "HEAD" operation

[Scott Klement <sk@xxxxxxxxxxxxxxxx>]

   Hello Hannes,
   I suspect that you are receiving the -1 because you've specified *NULL
   for the peSaveProc.  I don't think HTTPAPI allows this to be null.  Can
   you try specifying a procedure for this?  You can write a procedure
   that simply returns the length, but discards the data.
   If that does not work, then please post a debug/trace file.
   Good luck
   On 6/30/2014 9:45 AM, Hannes Rosner wrote:

   I want to perform a "HEAD" operation to get only the header information
   back.
   The idea is just to check if the object ( in this case: a picture)
   exists on the server.


   The way I try to do this is:

   -          http_persist_open()

   -          http_persist_req()

   -          http_persist_close()



   Testing with


   URL = '[1]http://www.wikipedia.de/img/logo.png';

   wwComm = http_persist_open( URL );

   rc = http_persist_req(`HEAD' :wwComm :URL :0 :*NULL :*NULL :0 :0 :*NULL
   );


   Will return rc= -1 ,but the debug log shows: "HTTP/1.1 200 OK"



   My questions are:

   -          Can I do:
   rc = http_persist_req(`HEAD' :wwComm :URL :0 :*NULL :*NULL :0 :0 :*NULL
   );
   To receive a return code "200" if the object exists.
   And to get additional header information:
   wrkHeaderInfo = http_header(`Name:');


   -          Or do I have to define the parameters "peSaveFD" and
   "peSaveProc" to the http_persist_req() ?
   And if yes, how should the parameter list for the "peSaveProc" look
   like?

   Any help and example is appreciated.

   Hannes


-----------------------------------------------------------------------
This is the FTPAPI mailing list.  To unsubscribe, please go to:
[2]http://www.scottklement.com/mailman/listinfo/ftpapi
-----------------------------------------------------------------------

References

   1. http://www.wikipedia.de/img/logo.png
   2. http://www.scottklement.com/mailman/listinfo/ftpapi

-----------------------------------------------------------------------
This is the FTPAPI mailing list.  To unsubscribe, please go to:
http://www.scottklement.com/mailman/listinfo/ftpapi
-----------------------------------------------------------------------