class HTTP::Server
Overview
An HTTP server.
A server is given a handler that receives an HTTP::Server::Context
that holds
the HTTP::Request
to process and must in turn configure and write to an HTTP::Server::Response
.
The HTTP::Server::Response
object has status
and headers
properties that can be
configured before writing the response body. Once response output is written,
changing the status
and headers
properties has no effect.
The HTTP::Server::Response
is also a write-only IO
, so all IO
methods are available
in it.
The handler given to a server can simply be a block that receives an HTTP::Server::Context
,
or it can be an HTTP::Handler
. An HTTP::Handler
has an optional next
handler,
so handlers can be chained. For example, an initial handler may handle exceptions
in a subsequent handler and return a 500 status code (see HTTP::ErrorHandler
),
the next handler might log the incoming request (see HTTP::LogHandler
), and
the final handler deals with routing and application logic.
Simple Setup
A handler is given with a block.
require "http/server"
server = HTTP::Server.new(8080) do |context|
context.response.content_type = "text/plain"
context.response.print "Hello world!"
end
puts "Listening on http://127.0.0.1:8080"
server.listen
With non-localhost bind address
require "http/server"
server = HTTP::Server.new("0.0.0.0", 8080) do |context|
context.response.content_type = "text/plain"
context.response.print "Hello world!"
end
puts "Listening on http://0.0.0.0:8080"
server.listen
Add handlers
A series of handlers are chained.
require "http/server"
HTTP::Server.new("127.0.0.1", 8080, [
HTTP::ErrorHandler.new,
HTTP::LogHandler.new,
HTTP::CompressHandler.new,
HTTP::StaticFileHandler.new("."),
]).listen
Add handlers and block
A series of handlers is chained, the last one being the given block.
require "http/server"
server = HTTP::Server.new("0.0.0.0", 8080,
[
HTTP::ErrorHandler.new,
HTTP::LogHandler.new,
]) do |context|
context.response.content_type = "text/plain"
context.response.print "Hello world!"
end
server.listen
Defined in:
http/server/context.crhttp/server/response.cr
http/server.cr
Class Method Summary
-
.build_middleware(handlers, last_handler : Context -> ? = nil)
Builds all handlers as the middleware for
HTTP::Server
. - .new(host : String, port : Int32, handlers : Array(HTTP::Handler), &handler : Context -> )
- .new(port, handlers : Array(HTTP::Handler), &handler : Context -> )
- .new(host : String, port : Int32, &handler : Context -> )
- .new(port, &handler : Context -> )
- .new(host : String, port : Int32, handlers : Array(HTTP::Handler))
- .new(host : String, port : Int32, handler : HTTP::Handler | HTTP::Handler::Proc)
- .new(port, handlers : Array(HTTP::Handler))
- .new(port, handler)
Instance Method Summary
-
#bind(reuse_port = false)
Creates the underlying
TCPServer
if the doesn't already exist. -
#close
Gracefully terminates the server.
-
#listen(reuse_port = false)
Starts the server.
-
#port
Returns the TCP port the server is connected to.
- #tls : OpenSSL::SSL::Context::Server?
- #tls=(tls : OpenSSL::SSL::Context::Server?)
Instance methods inherited from class Reference
==(other : self)==(other) ==, dup dup, hash hash, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference)
same?(other : Nil) same?, to_s(io : IO) : Nil to_s
Class methods inherited from class Reference
new
new
Instance methods inherited from class Object
!=(other)
!=,
!~(other)
!~,
==(other)
==,
===(other : JSON::Any)===(other : YAML::Any)
===(other) ===, =~(other) =~, class class, dup dup, hash hash, inspect(io : IO)
inspect inspect, itself itself, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, tap(&block) tap, to_json(io : IO)
to_json to_json, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ") to_pretty_json, to_s
to_s(io : IO) to_s, to_yaml(io : IO)
to_yaml to_yaml, try(&block) try
Class methods inherited from class Object
from_json(string_or_io, root : String) : selffrom_json(string_or_io) : self from_json, from_yaml(string_or_io) : self from_yaml
Class Method Detail
Builds all handlers as the middleware for HTTP::Server
.
Instance Method Detail
Creates the underlying TCPServer
if the doesn't already exist.
You may set reuse_port to true to enable the SO_REUSEPORT
socket option,
which allows multiple processes to bind to the same port.
Gracefully terminates the server. It will process currently accepted requests, but it won't accept new connections.
Starts the server. Blocks until the server is closed.
See #bind
for details on the reuse_port argument.
Returns the TCP port the server is connected to.
For example you may let the system choose a port, then report it:
server = HTTP::Server.new(0) { }
server.bind
server.port # => 12345