RewriteEngine On

# -------------------------------------------
# 1. Rewrite /blog/<ID> to /blog.php?id=<ID>
# -------------------------------------------
RewriteRule ^blog/([^/]+)/?$ /blog.php?id=$1 [L,QSA]

RewriteRule ^sitemap\.xml$ /sitemap.php

# ----------------------------------------------------
# 2. Rewrite /lib/* or /blog/* to /error.php?code=404
#     with 404 response code (internal rewriting)
# ----------------------------------------------------
RewriteCond %{REQUEST_URI} ^/(lib|blog)(/.*)?$
RewriteRule ^ - [R=404,L]
ErrorDocument 404 /error.php?code=404

# ----------------------------------------------------
# 3. Custom error handler for all other errors
#     Sends proper status code to client
# ----------------------------------------------------
ErrorDocument 400 /error.php?code=400
ErrorDocument 401 /error.php?code=401
ErrorDocument 403 /error.php?code=403
ErrorDocument 500 /error.php?code=500
ErrorDocument 502 /error.php?code=502
ErrorDocument 503 /error.php?code=503


# RewriteEngine On

# ErrorDocument 404 /404.php

# RewriteRule ^b/([0-9]+)$ /blog.php?id=$1 [QSA,L]

# RewriteRule ^/lib - [R=404,L]

# RewriteCond %{REQUEST_FILENAME} !-f
# RewriteCond %{REQUEST_FILENAME} !-d
# RewriteRule ^.*$ - [R=404,L]