看NGINX配置SAMPLE時看到這樣一個BLOCK：
1# Allow "Well-Known URIs" as per RFC 5785
2 location ~* ^/.well-known/ {
3 allow all;
4 }聯想到之前使用Let’s Encrypt SSL 證書的時候也有添加一個路徑配置是.well-known的，Y.Cheung 好奇這個路徑究竟有什麼用。
在「RFC5785」中描述如下：
A well-known URI is a URI [RFC3986] whose path component begins with the characters “/.well-known/”, and whose scheme is “HTTP”, “HTTPS”, or another scheme that has explicitly been specified to use well- known URIs.
Applications that wish to mint new well-known URIs MUST register them, following the procedures in Section 5.1.
For example, if an application registers the name ’example’, the corresponding well-known URI on ‘http://www. example .com/’ would be ‘http://www. example .com/.well-known/example’.
Registered names MUST conform to the segment-nz production in [RFC3986].
Note that this specification defines neither how to determine the authority to use for a particular context, nor the scope of the metadata discovered by dereferencing the well-known URI; both should be defined by the application itself.
Typically, a registration will reference a specification that defines the format and associated media type to be obtained by dereferencing the well-known URI.
