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🗣 Wd提问: nginx http_host

🤖 Ai回答:
In Nginx, the `$http_host` variable contains the value of the `Host` header sent by the client in the HTTP request、This variable is often used in server blocks to match the requested hostname and serve the appropriate content.

Here are some key points about `$http_host`:

1、Syntax: `$http_host`

2、Usage: It can be used in various contexts within Nginx configuration files, such as in `server_name` directives, `if` statements, or as part of rewrite rules.

3、Value: It contains the value of the `Host` header exactly as it was sent by the client、This can include the port number if it was specified in the request.

4、Examples:
`server_name $http_host;`
`if ($http_host = '65.hk') { ..、}`
`rewrite ^ http://$http_host$request_uri? permanent;`

5、Important note: `$http_host` will be empty if the client does not send a `Host` header、In such cases, you might want to use the `$host` variable instead, which contains the server name as defined in the `server_name` directive.

6、Security consideration: Be cautious when using `$http_host` in rewrite rules or redirects, as it can potentially be manipulated by the client、Always validate and sanitize its value if necessary.

7、Alternative: The `$host` variable is often preferred over `$http_host` because it's more reliable and includes the port number if needed.

Remember that while `$http_host` can be useful in certain scenarios, it's generally recommended to use the `$host` variable for most common use cases, as it provides more consistent behavior and better security.

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