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= cowboy_req:cert(3)
== Name
cowboy_req:cert - Client TLS certificate
== Description
[source,erlang]
----
cert(Req :: cowboy_req:req()) -> binary() | undefined
----
Return the peer's TLS certificate.
Using the default configuration this function will always return
`undefined`. You need to explicitly configure Cowboy to request
the client certificate. To do this you need to set the `verify`
transport option to `verify_peer`:
[source,erlang]
----
{ok, _} = cowboy:start_tls(example, [
{port, 8443},
{certfile, "path/to/cert.pem"},
{verify, verify_peer}
], #{
env => #{dispatch => Dispatch}
}).
----
You may also want to customize the `verify_fun` function. Please
consult the `ssl` application's manual for more details.
TCP connections do not allow a certificate and this function
will therefore always return `undefined`.
The certificate can also be obtained using pattern matching:
[source,erlang]
----
#{cert := Cert} = Req.
----
== Arguments
Req::
The Req object.
== Return value
The client TLS certificate.
== Changelog
* *2.1*: Function introduced.
== Examples
.Get the client TLS certificate.
[source,erlang]
----
Cert = cowboy_req:cert(Req).
----
== See also
link:man:cowboy_req(3)[cowboy_req(3)],
link:man:cowboy_req:peer(3)[cowboy_req:peer(3)],
link:man:cowboy_req:sock(3)[cowboy_req:sock(3)]
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