:relfileprefix: ../../
[#3FBB8E8EE00C20B8A628639C6E30D44A93002FF5]

= Enum scheme

pass:v,q[Identifies a known URL scheme]


== Synopsis

Declared in header `</boost/url/scheme.hpp#L33[boost/url/scheme.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
enum scheme : unsigned short;
----

== Members
[,cols=2]
|===
|Name |Description
|none |pass:v,q[Indicates that no scheme is present]

|unknown |pass:v,q[Indicates the scheme is not a well-known scheme]

|ftp |pass:v,q[File Transfer Protocol (FTP)]

|file |pass:v,q[File URI Scheme]

|http |pass:v,q[The Hypertext Transfer Protocol URI Scheme]

|https |pass:v,q[The Secure Hypertext Transfer Protocol URI Scheme]

|ws |pass:v,q[The WebSocket URI Scheme]

|wss |pass:v,q[The Secure WebSocket URI Scheme]

|===

== Description


=== Specification

* link:https://datatracker.ietf.org/doc/html/rfc3986#section-3.1[3.1. Scheme (rfc3986)]