gssapi basic auth but using gssapi session cookies

[richo25]

OK I'm not having much luck figuring this out.
I've got gssapi doing authentication via gssproxy (enabled in the enviro vars during apache startup).
I need Basic Auth enabled for some windows clients which don't natively have kerberos ticket capabilities.

So

    AuthType GSSAPI
    AuthName "EMIT Single Sign On Login"
    GssapiNegotiateOnce On
    GssapiBasicAuth On

I'm trying to get gssapi session cookies to be used in place of basic Auth if a user has authenticate at least once.
So I'm adding:

    GssapiUseSessions On
    GssapiSessionKey key:secret_key
    Session On
    SessionCookieName gssapi_session path=/;httponly;secure;
    SessionCryptoPassphrase "secret_passphrase"
    Require valid-user

Now it seems that web browsers send the basic auth info in the request header "Authorization : basic .. blabla " of subsequent requests even though the cookie has been set.
I think this triggers apache to re-authenticate again an generate a new session token every time.. dumping / ignoring the one that has been set in the request header..
This is massively slowing down the pages responsiveness, to add nearly 1 second to every get request the browser makes while loading the page.
I don't know exactly know why the auth stage is so incredibly slow as a aide quest..

Now there have been methods mentioning having GssapiBasicAuth set to Off for the bulk of the website while keeping the cookie stuff there.
And then having a single "login" page in a location block that has BasicAuth turned on.
But I'm going through an apache proxy setup as part of this, think Jenkins running on the same server but at firewalled port 8080.

And I just can't seem to find the magic combination to get this to work..
Here is what our current config with gssapi auth looks like. But it is stupidly slow and doesn't seem to be using the session cookies..

<Location /jenkins/>
  SSLOptions +StrictRequire +ExportCertData +StdEnvVars +OptRenegotiate
  SSLRequireSSL
  SSLRequire ( %{HTTP_HOST} eq "jenkins.mydomain" )

  RewriteEngine on
  RewriteCond %{HTTPS} !=on
  RewriteRule .* - [F]

  ProxyPass          http://localhost:8080/jenkins/ nocanon
  ProxyPassReverse   http://localhost:8080/jenkins/
  ProxyPassReverse   http://jenkins.mydomain/jenkins/
  ProxyPassReverse   https://jenkins.mydomain/jenkins/
  ProxyPreserveHost On

  RequestHeader set X-Forwarded-Host "jenkins.mydomain"
  RequestHeader set X-Forwarded-Proto "https"
  RequestHeader set X-Forwarded-Port "443"

</Location>

<Proxy http://localhost:8080/jenkins/*>
   # Take three see if this method speeds things up
   AuthType GSSAPI
   AuthName "Single Sign On Login"

   # Avoid Windows/Chrome from getting stuck trying NTLM
   GssapiNegotiateOnce On

   # Enable Basic Auth Fallback
   GssapiBasicAuth On

   # Enable Apache Sessioning for both GSSAPI & Basic Auth
   GssapiUseSessions On
   GssapiSessionKey key:secret_key

   # Encrypt the session cookie
   Session On
   SessionCookieName gssapi_session path=/;httponly;secure;
   SessionCryptoPassphrase "secret_passprhase"

   Require valid-user

  Order deny,allow
  Allow from all
</Proxy>

I'm not even sure if that authentication stuff is meant to be in the proxy block, there are lots of conflicting views on that..

There are methods that talk about splitting the auth domains into an everything else that uses the cookie and redirects via a 401? to a login URL if that cookie fails.
On that page they can login and be given a gss session cookie after basic auth passes.
and get redirected back to the main URL which only uses cookies no BasicAuth enable flag etc...
But I'm having no luck getting that method going..

Any help would be appreciated

Cheers
Richard