December 2007
Beginner to intermediate
310 pages
8h 8m
English
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13.6. Handling Missing Host: Header Fields
Problem
You want to treat differently all requests that are made without
a Host request header field.
Solution
SetEnvIf Host "^$" no_host=1
Order Allow,Deny
Allow from all
Deny from env=no_host
RewriteCond "%{HTTP_HOST}" "^$"
RewriteRule ".*" - [F,L]Discussion
The Host: request header
field is essential to correct handling of name-based virtual hosts
(see Recipe 4.1).
If the client doesn’t include it, the chances are very good that the
request will be directed to the wrong virtual host. All modern
browsers automatically include this field, so only custom-written or
very old clients are likely to encounter this issue.
The solutions given will cause such requests to be rejected with
a 403 Forbidden status; the exact
text of the error page can be tailored with an ErrorDocument
403 directive.
The first solution is slightly more efficient.
See Also
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