--ip-allow <IP>|<network/prefix> ...
--ip-allow-file <file> ...
    Only allow client access from specific IP or network.
    Unmatched client IP will be denied.

--ip-deny <IP>|<network/prefix> ...
--ip-deny-file <file> ...
    Only denly client access from specific IP or network.
    Unmatched client IP will be allowed to access.

--rewrite-host <separator><match><separator><replace>
    Transform a request host+URL (in the form of "host[:port]/request/path?param=value")
    into another URL if it is matched by regular expression `match`.

    The rewrite target is specified by `replace`.
    Use `$0` to represent the whole match in `match`.
    use `$1` - `$9` to represent sub matches in `match`.
--rewrite-host-post <sep><match><sep><replace>
    Similar to --rewrite-host, but executes after redirects has no match.
--rewrite-host-end <sep><match><sep><replace>
    Similar to --rewrite-host-post, but skip rest process if matched.

--rewrite <separator><match><separator><replace>
    Transform a request URL (in the form of "/request/path?param=value")
    into another one if it is matched by regular expression `match`.

    The rewrite target is specified by `replace`.
    Use `$0` to represent the whole match in `match`.
    use `$1` - `$9` to represent sub matches in `match`.
--rewrite-post <sep><match><sep><replace>
    Similar to --rewrite, but executes after redirects has no match.
--rewrite-end <sep><match><sep><replace>
    Similar to --rewrite-post, but skip rest process if matched.

--redirect <separator><match><separator><replace>[<separator><status-code>]
    Perform an HTTP redirect when request URL (in the form of "/request/path?param=value")
    is matched by regular expression `match`.

    The redirect target is specified by `replace`.
    Use `$0` to represent the whole match in `match`.
    use `$1` - `$9` to represent sub matches in `match`.

    Optional `status_code` specifies HTTP redirect code. defaults to 301.

--proxy <separator><match><separator><replace>
    Proxy a request URL (in the form of "/request/path?param=value")
    to target if it is matched by regular expression `match`.

    The proxy target is specified by `replace`.
    Use `$0` to represent the whole match in `match`.
    use `$1` - `$9` to represent sub matches in `match`.

--return <separator><match><separator><status-code>
    When request URL (in the form of "/request/path?param=value")
    is matched by `match`, return the status code `status-code`
    immediately and stop processing.
--to-status <separator><match><separator><status-code>
    Similar to --return, but process after ghfs internal process finished.

--status-page <separator><status-code><separator><fs-path>
    When response status is `status-code`, respond with the file content from `fs-path`.

--header-add <separator><match><separator><name><separator><value>
--header-set <separator><match><separator><name><separator><value>
    Add or set response header if URL(in the form of "/request/path?param=value")
    matches `match`.

# when requesting http://localhost:8080/redirect/www.example.com, redirect to https://www.example.com
ehfs -l 8080 -r /path/to/share --redirect '#/redirect/(.*)#https://$1'

ehfs -l 8080 -r /path/to/share --redirect '#(.*)\.html#$1' --rewrite-post '#^.*/[^/.]+$#$0.html'

ehfs -l 8080 -r /path/to/share --status-page '#404#/path/to/404/file'

ehfs -l 8080 -r /path/to/share --return '#.git|.htaccess#403'

go build main.go