如何获取文件的内容类型

Question

I am implementing a HTTP/1.0 server that processes GET or HEAD request.

I've finished Date , Last-Modified , and Content-Length , but I don't know how to get the Content-Type of a file.

It has to return directory for directory(which I can do using stat() function), and for a regular file, text/html for text or html file, and image/gif for image or gif file.

Should this be hard-coded, using the name of the file?

I wonder if there is any function to get this Content-Type .

Answer 1

您可以查看文件扩展名（大多数Web服务器都执行此操作-参见例如/etc/mime.types文件；也可以使用libmagic通过查看文件的前几个字节来自动确定内容类型。 。

Answer 2

It depends how sophisticated you want to be.

If the files in question are all properly named and there are only several types to handle, having a switch based file suffix is sufficient. Going to the extreme case, making the right decision no matter what the file is would probably require either duplicating the functionality of Unix file command or running it on file in question (and then translating the output to the proper Content-Type ).