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Elm error to string

How could Response String use in the BadPayload type definition while it refers to Response body i. What is the purpose or the goal of that? getString returns the response of the get request as a String. get take a JSON decoder and runs that over the response of the get request. If your http request fails the best way to debug is to look at what kind of error you get. hats : Task Error String hats = getString com/ hat- categories. get : Decoder value - > String - > Task Error value. Send a GET request to the given URL. You also specify how to decode the response. Error type is a union type that can hold the the response code if there was any.

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  • Video:Error string

    String error

    type Error = Timeout | NetworkError | UnexpectedPayload String | BadResponse Int String. You can case over the err nd a Request. We could get the text of “ War and Peace” like this: import Http type Msg = Click | NewBook ( Result Http. Error String) update : Msg - > Model - > Model update msg model = case msg of Click - > ( model, getWarAndPeace ). One area I' ve been glossing over as I' ve been working with HTTP in Elm is error checking. For the sample projects, I' ve either been ignoring errors or blindly converting any errors to a string and. module ArchictectureErrorHandler where. import Text exposing ( fromString). Decode as Json exposing (. ) import StartApp exposing ( start). import Html exposing (. ) import Http exposing ( get, Error). import this post I' ll outline the types of “ error” situations you can find yourself in when writing Elm applications and I' ll. The compiler will guarantee that if you declare a constant as a String, for example, that constant could only. Namely, the Msg constructor GetDataResult should have a single parameter of type Result Http.

    The compiler error you received would occur if the signature were instead Result Http. You can convert anything to a string using toString. That will give you nearly the same output as your case statements: toString Timeout = = " Timeout" toString NetworkError = = " NetworkError" toString ( UnexpectedPayload " Error" ).