HTTP Basic Auth Exclude Single File

AuthUserFile /path/to/.htpasswd
AuthName "Authorization Required"
AuthType Basic
require valid-user
<Files "thubservice.php">
    Satisfy Any
    Allow from all
</Files>

With Apache 2.4 you may want to use Require instead:

<Files "thubservice.php">
    Require all granted
</Files>

In 2.2, access control based on client hostname, IP address, and other characteristics of client requests was done using the directives Order, Allow, Deny, and Satisfy.

In 2.4, such access control is done in the same way as other authorization checks, using the new module mod_authz_host. The old access control idioms should be replaced by the new authentication mechanisms, although for compatibility with old configurations, the new module mod_access_compat is provided.