Hi,
Please help me on below query:

During migration from Apache 2.0 to Apache 2.2 and compiling the
Apache 2.2.15 source code, we found following difference in the
function "ssl_io_filter_register" in the file "ssl_engine_io.c".

Apache 2.0 Source code:

void ssl_io_filter_register(apr_pool_t *p)
{
  ap_register_input_filter (ssl_io_filter, ssl_io_filter_input,
NULL, AP_FTYPE_CONNECTION + 5);
  ap_register_output_filter (ssl_io_filter, ssl_io_filter_output,
NULL, AP_FTYPE_CONNECTION + 5);
  ap_register_input_filter (ssl_io_buffer, ssl_io_filter_buffer,
NULL, AP_FTYPE_PROTOCOL);

  return;
}

Apache 2.2 Source code:

void ssl_io_filter_register(apr_pool_t *p)
{
  /* This filter MUST be after the HTTP_HEADER filter, but it also must be
  * a resource-level filter so it has the request_rec.
  */
  ap_register_output_filter ("UPGRADE_FILTER",
ssl_io_filter_Upgrade, NULL, AP_FTYPE_PROTOCOL + 5);

  ap_register_input_filter (ssl_io_filter, ssl_io_filter_input,
NULL, AP_FTYPE_CONNECTION + 5);
  ap_register_output_filter (ssl_io_filter, ssl_io_filter_output,
NULL, AP_FTYPE_CONNECTION + 5);
  ap_register_input_filter (ssl_io_buffer, ssl_io_filter_buffer,
NULL, AP_FTYPE_PROTOCOL);

  return;
}

Could you please let me know the reason for addition of below line and
additional function "ssl_io_filter_Upgrade" in Aapche 2.2.x as against
Apache 2.0.x:

ap_register_output_filter ("UPGRADE_FILTER", ssl_io_filter_Upgrade,
NULL, AP_FTYPE_PROTOCOL + 5);

Also what exactly "ssl_io_filter_Upgrade" function do in Apache 2.2.x,
which is missing in Apache 2.0.x?


Regards,
Matty

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