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Extra functions for more easily building and handling Http requests
version 2.1.0
license MIT
native-modules False
elm-version 0.18.0 <= v < 0.19.0
Tag 2.1.0
Committed At 2016-11-22 17:10:11 UTC
elm-lang/http 1.0.0 <= v < 2.0.0 1.0.0
elm-lang/core 5.0.0 <= v < 6.0.0 5.1.1




Build Status

Chainable functions for building HTTP requests and composable functions for handling responses.

Need help? Join the #http channel in the Elm Slack!

This is an Elm 0.18 fork of lukewestby's elm-http-builder package that provides an API for specifying Responses as well as Requests.


In this example, we expect a successful response to be JSON array of strings, like:

["hello", "world", "this", "is", "the", "best", "json", "ever"]

and an error response might have a body which just includes text, such as the following for a 404 error:

Not Found.

We'll use HttpBuilder.jsonReader and a Json.Decode.Decoder to parse the successful response body and HttpBuilder.stringReader to accept a string body on error without trying to parse JSON.

import Task exposing (Task)
import Time
import HttpBuilder exposing (..)
import Json.Decode as Decode
import Json.Encode as Encode

itemsDecoder : Decode.Decoder (List String)
itemsDecoder =
  Decode.list Decode.string

itemEncoder : String -> Encode.Value
itemEncoder item =
    [ ("item", Encode.string item) ]

addItem : String -> Task (HttpBuilder.Error String) (HttpBuilder.Response (List String))
addItem item = ""
    |> withJsonBody (itemEncoder item)
    |> withHeader "Content-Type" "application/json"
    |> withTimeout (10 * Time.second)
    |> withCredentials
    |> send (jsonReader itemsDecoder) stringReader