Doing HTTP request in Scala

You could use spray-client. The documentation is lacking (it took me some digging to find out how to make GET requests with query parameters) but it's a great option if you are already using spray. And the documentation is better than dispatch.

We're using it at AI2 over dispatch because the operators are less symbolic and we're already using spray/actors.

import spray.client.pipelining._

val url = "http://youruri.com/yo"
val pipeline: HttpRequest => Future[HttpResponse] = sendReceive

// Post with header and parameters
val responseFuture1: Future[String] = pipeline(Post(Uri(url) withParams ("param" -> paramValue), yourPostData) map (_.entity.asString)

// Post with header
val responseFuture2: Future[String] = pipeline(Post(url, yourPostData)) map (_.entity.asString)

I use the following: https://github.com/scalaj/scalaj-http.

Here's a simple GET request:

import scalaj.http.{Http, HttpOptions}

Http("http://example.com/search").param("q", "monkeys").asString

and an example of a POST:

val result = Http("http://example.com/url").postData("""{"id":"12","json":"data"}""")
  .header("Content-Type", "application/json")
  .header("Charset", "UTF-8")
  .option(HttpOptions.readTimeout(10000)).asString

Scalaj HTTP is available through SBT:

libraryDependencies += "org.scalaj" % "scalaj-http_2.11" % "2.3.0"

Using my Requests-Scala library:

// Mill
ivy"com.lihaoyi::requests:0.1.8"
// SBT
"com.lihaoyi" %% "requests" % "0.1.8"

This is as simple as

val r = requests.get("https://api.github.com/users/lihaoyi")

r.statusCode
// 200

r.headers("content-type")
// Buffer("application/json; charset=utf-8")

r.text
// {"login":"lihaoyi","id":934140,"node_id":"MDQ6VXNlcjkzNDE0MA==",...

val r = requests.post("http://httpbin.org/post", data = Map("key" -> "value"))

val r = requests.put("http://httpbin.org/put", data = Map("key" -> "value"))

val r = requests.delete("http://httpbin.org/delete")

val r = requests.head("http://httpbin.org/head")

val r = requests.options("http://httpbin.org/get")

I'm using dispatch: http://dispatch.databinder.net/Dispatch.html

They've just released a new version (0.9.0) with a complete new api that I really like. And it is async.

Example from project page:

import dispatch._
val svc = url("http://api.hostip.info/country.php")
val country = Http(svc OK as.String)

for (c <- country)
  println(c)

edit: This might help you https://github.com/dispatch/reboot/blob/master/core/src/main/scala/requests.scala