Object in URL not valid

Question

Hello,
I hope that someone can help me with my problem:
I have a BSP-Application where I have attachments.
and if I want to show one attachment i most of the time get the error object... in URL not valid.
For example: BSP Exception: Das Objekt 7D49254945056D07E100000080010A92 in der URL /sap(bD1kZSZjPTAzMw==)/bc/bsp/sap/zrdv_benuantr/7D49254945056D07E100000080010A92 ist nicht gültig.
But sometimes (after 10-15 attempts) it works...
The attachments are Excel-Sheets or Word-Dokuments.
in OnInitialization:
IF DO_DOWNLOAD = 'X'.
  CREATE OBJECT CACHED_RESPONSE TYPE CL_HTTP_RESPONSE
  EXPORTING ADD_C_MSG = 1.
  CACHED_RESPONSE->SET_DATA( W_ATTA-ATINH ).
  YWORK = W_ATTA-FCOTY.
  CACHED_RESPONSE->SET_HEADER_FIELD( NAME  =
  IF_HTTP_HEADER_FIELDS=>CONTENT_TYPE
  VALUE = YWORK ).
  CACHED_RESPONSE->SET_STATUS( CODE = 200 REASON = 'OK' ).
  CACHED_RESPONSE->SERVER_CACHE_EXPIRE_REL( EXPIRES_REL = 60 ).
  CALL FUNCTION 'GUID_CREATE'
    IMPORTING
      EV_GUID_32 = GUID.
  CONCATENATE RUNTIME->APPLICATION_URL '/' GUID INTO CACHED_URL.
  CL_HTTP_SERVER=>SERVER_CACHE_UPLOAD( URL      = CACHED_URL
  RESPONSE = CACHED_RESPONSE ).
ENDIF.
Layout:
  if do_download = 'X'.
        window.open('<%= cached_url%>','BV_Anlage_anzeigen');
  endif.
Thanks for your help
Helmut

Answer 1

Hi,
I guess you will find the entry everytime in the server cache, but only in one of the four application servers. So your applications works only in the few cases that the request to the URL is routed to the server where the cache-entry exists.
I don't know if there is a possibility to share the cache between the application servers. You may find further informations in SAP Help: http://help.sap.com/saphelp_nw70/helpdata/en/d7/446f3b19d99b0de10000000a11405a/frameset.htm
Instead of server cache you can also use the response object to provide the attachment:
* set the mime-type and file size in the response
          runtime->server->response->set_header_field(
            name  = 'Content-Type'
            value = value_mime_type ).
          runtime->server->response->set_header_field(
            name  = 'Content-Length'
            value = value_length ).
          runtime->server->response->delete_header_field(
            name = 'Cache-Control' ).
          runtime->server->response->delete_header_field(
            name = 'Expires' ).
*         set response data to be the file content
            concatenate 'attachment; filename=' attachment-name into value.
            runtime->server->response->set_header_field(
                             name  = 'content-disposition'
                             value = value ).
            runtime->server->response->set_data( hex_content ).
          navigation->response_complete( ).
Best regards,
CW