Handling errors from Plug.Parser

Phoenix Forum Questions / Help
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1

For file sanity checks that is being uploaded to phoenix ,

  • To validate mime, filename,etc
    • we get a Plug.Upload after being parsed by Plug.Parser, in actions.
  • but to put file size limit , Plug.Parsers are used.
    • in router
    • or in endpoint

But if file is large than given certain threshold, it raises.
exceptions.

defmodule RequestTooLargeError do @moduledoc """ Error raised when the request is too large. """ defexception message: "the request is too large. If you are willing to process " <> "larger requests, please give a :length to Plug.Parsers", plug_status: 413 end

how do i show info to the user, that what happened?. Instead of internal server error

defmodule RTValues do @moduledoc false def size_limit(), do: Application.get_env(:core, :size_limit) def parser_options(),i do: [ parsers: [ :urlencoded, {:multipart, length: size_limit()}, :json ], pass: ["*/*"], json_decoder: Phoenix.json_library() ] end 
defmodule Web.Router do pipeline :browser do plug Plug.Parsers,RTValues.parser_options() . . . end . . . end

how do i show info to the user, that what happened?. Instead of internal server error
what am i doing wrong?
SAME GOES FOR API ONLY ENDPOINT HANDLING

2

The plug upload limit is more of a safety feature than a validation. Consider using something like live view uploads if you want a more modern and interactive upload experience that will make it easier to provide feedback on stuff like file size.

1 Like
3

what about api endpoints?

4

use Plug.ErrorHandler
but dont know how to use that
i tried calling Parser from custom parser but that also didint work