Make a few link use https

README.asciidoc

@@ -18,8 +18,8 @@ Cowboy is *clean* and *well tested* Erlang code.
 
 == Online documentation
 
-* http://ninenines.eu/docs/en/cowboy/2.0/guide[User guide]
-* http://ninenines.eu/docs/en/cowboy/2.0/manual[Function reference]
+* https://ninenines.eu/docs/en/cowboy/2.0/guide[User guide]
+* https://ninenines.eu/docs/en/cowboy/2.0/manual[Function reference]
 
 == Offline documentation
 
@@ -34,4 +34,4 @@ Cowboy is *clean* and *well tested* Erlang code.
 
 * Official IRC Channel: #ninenines on irc.freenode.net
 * https://github.com/ninenines/cowboy/issues[Issues tracker]
-* http://ninenines.eu/services[Commercial Support]
+* https://ninenines.eu/services[Commercial Support]

doc/src/guide/erlang_web.asciidoc

@@ -188,7 +188,7 @@ blocks and patterns, rather than details like the syntax.
 
 You can most likely read it as a complete beginner, but
 you will need a companion book to make the most of it.
-Buy it from the http://ninenines.eu[Nine Nines website].
+Buy it from the https://ninenines.eu[Nine Nines website].
 
 ==== Programming Erlang
 

doc/src/guide/listeners.asciidoc

@@ -7,7 +7,7 @@ Depending on the connection handshake, one or another protocol
 may be used.
 
 This chapter is specific to Cowboy. Please refer to the
-http://ninenines.eu/docs/en/ranch/1.3/guide/listeners/[Ranch User Guide]
+https://ninenines.eu/docs/en/ranch/1.3/guide/listeners/[Ranch User Guide]
 for more information about listeners.
 
 Cowboy provides two types of listeners: one listening for

doc/src/guide/resp.asciidoc

@@ -37,7 +37,7 @@ use `cowboy_req:reply/3`:
 [source,erlang]
 ----
 Req = cowboy_req:reply(303, #{
-    <<"location">> => <<"http://ninenines.eu">>
+    <<"location">> => <<"https://ninenines.eu">>
 }, Req0).
 ----