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===== HEAD - Check file existence returning only the header =====

<code abap>
FUNCTION z_http_head.
*"----------------------------------------------------------------------
*"*"Local Interface:
*"  IMPORTING
*"     VALUE(URI) TYPE  STRING
*"     VALUE(URI_C) TYPE  CHAR1024 OPTIONAL
*"  EXPORTING
*"     VALUE(CONTENT_TYPE) TYPE  STRING
*"     VALUE(CODE) TYPE  I
*"     VALUE(REASON) TYPE  STRING
*"  EXCEPTIONS
*"      NO_LOGIN_ACCOUNT_AVAILABLE
*"      HTTP_COMMUNICATION_FAILURE
*"      HTTP_INVALID_STATE
*"      HTTP_PROCESSING_FAILED
*"      HTTP_SEND_RECEIVE_ERROR
*"      OTHERS
*"----------------------------------------------------------------------
*   IperCube 2007
*"----------------------------------------------------------------------

  DATA: user TYPE string,
        pwd TYPE string,
        x_bytes TYPE i.
 
* Set User/Password Logon to web server
  user = 'my_user'.
  pwd  = 'my_password'.
  
* Translate URL
  TRANSLATE uri USING ' *'.
  REPLACE ALL OCCURRENCES OF '*' IN uri WITH '%20' IN CHARACTER MODE.

* Create HTTP_CLIENT object
  DATA: client TYPE REF TO if_http_client,
        timeout       TYPE i VALUE 0.

  CALL METHOD cl_http_client=>create_by_url
    EXPORTING
      url    = uri
    IMPORTING
      client = client.

  IF sy-subrc <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
*            WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.

* Authentication
  CALL METHOD client->authenticate
    EXPORTING
*    PROXY_AUTHENTICATION = ' '
*      CLIENT               = sy-mandt
      username             = user
      password             = pwd
*      LANGUAGE             = 'E'
      .

* Set Header Fields
  CALL METHOD client->request->set_header_field
    EXPORTING
      name  = '~request_method'
      value = 'HEAD'.


  CALL METHOD client->request->set_header_field
    EXPORTING
      name  = '~server_protocol'
      value = 'HTTP/1.0'.


* Send Request via HTTP
  CALL METHOD client->send
    EXPORTING
      timeout                    = timeout
    EXCEPTIONS
      http_communication_failure = 1
      http_invalid_state         = 2
      http_processing_failed     = 3
      OTHERS                     = 4.

  CASE sy-subrc.
    WHEN 1. RAISE http_communication_failure.
    WHEN 2. RAISE http_invalid_state.
    WHEN 3. RAISE http_processing_failed.
    WHEN 4. RAISE http_send_receive_error.
  ENDCASE.

* Receive Response via HTTP
  CALL METHOD client->receive
    EXCEPTIONS
      http_communication_failure = 1
      http_invalid_state         = 2
      http_processing_failed     = 3
      OTHERS                     = 4.

  CASE sy-subrc.
    WHEN 1. RAISE http_communication_failure.
    WHEN 2. RAISE http_invalid_state.
    WHEN 3. RAISE http_processing_failed.
    WHEN 4. RAISE http_send_receive_error.
  ENDCASE.

* Get Content Type
  content_type = client->response->get_header_field( name = 'content-type' ).

* Get Message
  CALL METHOD client->response->get_status
    IMPORTING
      code   = code
      reason = reason.

* Close connection
  CALL METHOD client->close
    EXCEPTIONS
      http_invalid_state = 1
      OTHERS             = 2.

  CASE sy-subrc.
    WHEN 1. RAISE http_invalid_state.
    WHEN 2. RAISE others.
  ENDCASE.

ENDFUNCTION.
</code>
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