elixir - How to enforce JSON encoding for Phoenix Request? -

there's api made phoenix, api works json.

but, when test , sent json curl fail because phoenix doesn't parse request json. need explicitly add application/json header curl. i'd make more robust , tell phoenix parse requests json.

is there way force phoenix treat requests json , parse json?

update

i tried use plug set request headers @abm suggested, following code in router:

def set_format conn, format plug.conn.put_private conn, :phoenix_format, format end  def put_req_header conn, {key, value} plug.conn.put_req_header conn, key, value end  pipeline :api   plug :put_req_header, {"accept", "application/json"}   plug :put_req_header, {"content-type", "application/json"}   plug :set_format, "json"   plug :accepts, ["json"] end 

the request has been made curl

curl -x post http://localhost:4000/api/upload -d '{"key": "value"}'                     

the connection looks like:

%plug.conn{adapter: {plug.adapters.cowboy.conn, :...}, assigns: %{},  before_send: [#function<1.93474994/1 in plug.logger.call/2>,   #function<0.119481890/1 in phoenix.livereloader.before_send_inject_reloader/1>],  body_params: %{"{\"key\": \"value\"}" => nil},  cookies: %plug.conn.unfetched{aspect: :cookies}, halted: false,  host: "localhost", method: "post", owner: #pid<0.483.0>,  params: %{"{\"key\": \"value\"}" => nil},  path_info: ["api", "upload"], peer: {{127, 0, 0, 1}, 58408},  port: 4000,  private: %{app.router => {[], %{}},    :phoenix_action => :upload,    :phoenix_controller => apicontroller, :phoenix_endpoint => app.endpoint,    :phoenix_format => "json", :phoenix_layout => {layoutview, :app},    :phoenix_pipelines => [:api],    :phoenix_route => #function<8.59735990/1 in app.router.match_route/4>,    :phoenix_router => app.router, :phoenix_view => apiview,    :plug_session_fetch => #function<1.89562996/1 in plug.session.fetch_session/1>},  query_params: %{},  query_string: "", remote_ip: {127, 0, 0, 1},  req_cookies: %plug.conn.unfetched{aspect: :cookies},  req_headers: [{"user-agent", "curl/7.37.1"}, {"host", "localhost:4000"},   {"accept", "application/json"}, {"content-length", "16"},   {"content-type", "application/json"}],  request_path: "/api/upload", resp_body: nil, resp_cookies: %{},  resp_headers: [{"cache-control", "max-age=0, private, must-revalidate"},   {"x-request-id", "xxx"}], scheme: :http,  script_name: [],  secret_key_base: "xxx",  state: :unset, status: nil} 

it works if add -h "content-type: application/json" parameter curl, without it doesn't work.

if google , want implement such behaviour.

lib/%app_name%/endpoint.ex

 plug plug.head   # add custom plug   plug :set_format, "json" 

define it:

  defp set_format(conn, format)     if regex.match?(~r/^api.*/, conn.host)       plug.conn.put_private conn, :phoenix_format, format     else       conn     end   end 

in example have dirty hack enforce json format subdomain api

it's not recommended since phoenix enforcing html @ time hack fix ridiculous behaviour like: elixir.phoenix.router.norouteerror pipeline :api show 404.json instead of 404.html