How to use the scala dispatch library to send a post request to the server in the Lift?
I want t开发者_StackOverflow中文版o use the scala dispatch library to send a post request to the server in the Lift.
I want to send a post request to the external server and get some information and then use this information in my web app.
How can I do this?
The Lift GitHub Wiki (which is being replaced by the Assembla one), has an article on using Dispatch along the lines of what you're seeking.
Here is a snippet that dispatches REST calls to a server:
val http = new Http
val call = parse(event.call)
val verbspec = (call \ "verb").values toString
val urlspec = (call \ "url").values toString
val namespec = (call \ "username").values toString
val pwspec = (call \ "password").values toString
val req = url(urlspec).as(namespec, pwspec) <:< Map("Content" -> "application/json")
val (status: Int, contentWrap, headers) = verbspec match {
case "GET" => {
http x (( req >:> identity ) {
case (200, _, Some(thing), out) => {
val resp = fromInputStream(thing.getContent()).getLines.mkString
(200, Some(resp), out())
}
case (badCode, _, _, out) => (badCode, None, out())
})
}
case "POST" => {
http x (( req.POST << (event.payload) >:> identity ) {case (status, _, _, out) => (status, None, out()) })
}
case "PUT" => {
http x (( req.PUT <<< (event.payload) >:> identity ) {case (status, _, _, out) => (status, None, out()) })
}
case _ => {
EventHandler.error(this, "Bad verb specified")
(000, None, Map.empty)
}
}
Where:
event.call
-> json specifying the call
event.payload
-> json payload for PUT and POST
http x
-> http://databinder.net/dispatch-doc/#dispatch.Http
>:>
-> http://databinder.net/dispatch-doc/#dispatch.HandlerVerbs
<<
, <<<
, <:<
-> http://databinder.net/dispatch-doc/#dispatch.RequestVerbs
This uses Lift JSON for parsing the call spec and executes in a Akka actor. Status, headers and content is returned to the calling actor.
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