NAME

       vmod_header - Header VMOD for Varnish

SYNOPSIS

          import header [from "path"] ;

          VOID append(HEADER, STRING)

          VOID copy(HEADER, HEADER)

          STRING get(HEADER header, STRING regex)

          VOID remove(HEADER header, STRING regex)

DESCRIPTION

       Varnish  Module  for  manipulation  of  duplicated  HTTP  headers,  for  instance multiple
       Set-Cookie headers.

       Example:

          vcl 4.0;
          import header;

          backend default { .host = "192.0.2.11"; .port = "8080"; }

          sub vcl_backend_response {
              if (beresp.http.Set-Cookie) {
                  # Add another line of Set-Cookie in the response.
                  header.append(beresp.http.Set-Cookie, "VSESS=abbabeef");

                  # CMS always set this, but doesn't really need it.
                  header.remove(beresp.http.Set-Cookie, "JSESSIONID=");
              }
          }

   VOID append(HEADER, STRING)
       Description
              Append an extra occurrence to an existing header.

       Example
              :: header.append(beresp.http.Set-Cookie, "foo=bar")

   VOID copy(HEADER, HEADER)
       Description
              Copy all source headers to a new header.

       Example
              :: header.copy(beresp.http.set-cookie, beresp.http.x-old-cookie);

   STRING get(HEADER header, STRING regex)
       Description
              Fetches the value of the first header that matches  the  given  regular  expression
              regex.

       Example
              :: set beresp.http.xusr = header.get(beresp.http.set-cookie,"user=");

   VOID remove(HEADER header, STRING regex)
       Description
              Remove all occurences of header that matches regex.

       Example
              :: header.remove(beresp.http.set-cookie,"^(?!(funcookie=))");

ACKNOWLEDGEMENTS

       The  development  of  this  plugin  was  made  possible  by  the  sponsorship of Softonic,
       http://en.softonic.com/ .

       Also thanks to Imo Klabun and Anders Nordby for bug reports.

BUGS

       You can't use dynamic regular expressions,  which  also  holds  true  for  normal  regular
       expressions in regsub().

                                                                                   VMOD_HEADER(3)