[erlang-questions] Webmachine content_types_accepted w/ POST

Loïc Hoguin <>
Tue Mar 8 13:09:30 CET 2016

On 03/08/2016 12:07 PM, Torben Hoffmann wrote:
> Hi,
> I have a URI where I accept a POST.
> It has to support one or multiple entities for creation as JSON in the
> body.
> So post_is_create/2 should return false.
> Hence I have to implement process_post/2 to deal with the POST.
> So far, so good.
> But I have to write
> content_types_accepted(RD, Ctx) ->
>      {[{"application/json", bogus_handler_name}], RD, Ctx}.
> for the JSON body to be accepted.

Cowboy REST has the same behavior. I recommend putting undefined 
personally. I suppose '' would also work.

It might be worth having a special return value known to 
Webmachine/Cowboy that would never get dispatched, in case the developer 
leaves GET enabled.

> I can write whatever as the handler function, because it will not be
> called by Webmachine.
> I only allow JSON on that POST, so I can control it and return an empty
> list of accepted types for other URI/method combos.
> It seems a little dirty to me.
> I can live with it, just wanted to hear what others do.
> Cheers,
> Torben

Loïc Hoguin
Author of The Erlanger Playbook,
A book about software development using Erlang

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