Korbin73
I’m trying to set the header with an addition value in a phoenix unit (integration) test:
@tag integration: true
test "should record the incoming request made to forwarding service" do
conn_with_api_header = build_conn()
|> Plug.Conn.put_req_header("x-mashape-key", "some_test_key" )
conn = post(conn_with_api_header, "/api/cards")
end
When I run the test I’m getting the following error:
** (ArgumentError) argument error
code: conn = post(conn_with_api_header, “/api/cards”)
stacktrace:
:erlang.iolist_to_binary([{“x-mashape-key”, “some_test_key”}])
Does anyone know how to set or add entries to the header when testing endpoints? I didn’t see anything in the docs that allows this option.
Where Next?
Trending in Questions
Other Trending Topics
Latest Phoenix Threads
Latest on Elixir Forum
Sponsor Spotlight
At WyeWorks, we believe great software is built by combining technical excellence with genuine human connection
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #library
- #deployment
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #elixirconf
- #channels
- #exunit
- #discussion
- #code-sync
- #podcasts
- #javascript
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #ai
- #elixirconf-us
- #blog-post
- #elixir-ls
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #api
- #forms
- #hex
- #security
- #metaprogramming
Our Sponsors
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Error tracking, logs, uptime, and Just Enough APM. Built for developers.
Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!
Bringing learning, work and compliance together since 1987.
**Building the future of software with AI, trust, and human connection.**
The deployment platform built for Elixir: PaaS ease, VPS control.
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"
Showing Posts 1 to 2- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
idi527
I don’t see any errors with your posted code … Can you post the full stacktrace? Maybe the error comes from your application code.
Korbin73
Wow, you nailed it without even seeing the code! My test was actually doing the correct thing and I was assuming my test was wrong shakes head. After looking at the rest of the call stack I realize I was looking in the wrong place:
(httpoison) lib/httpoison/base.ex:787: HTTPoison.Base.request/6
(proxy_host) lib/proxy_host_web/controllers/proxy_controller.ex:65: ProxyHostWeb.ProxyController.make_http_call/3
(proxy_host) lib/proxy_host_web/controllers/proxy_controller.ex:101: ProxyHostWeb.ProxyController.respond_by_mode/4
(proxy_host) lib/proxy_host_web/controllers/proxy_controller.ex:123: ProxyHostWeb.ProxyController.index/4
(proxy_host) lib/proxy_host_web/controllers/proxy_controller.ex:1: ProxyHostWeb.ProxyController.action/2
(proxy_host) lib/proxy_host_web/controllers/proxy_controller.ex:1: ProxyHostWeb.ProxyController.phoenix_controller_pipeline/2
(proxy_host) lib/proxy_host_web/endpoint.ex:1: ProxyHostWeb.Endpoint.instrument/4
(phoenix) lib/phoenix/router.ex:275: Phoenix.Router.call/1
(proxy_host) lib/proxy_host_web/endpoint.ex:1: ProxyHostWeb.Endpoint.plug_builder_call/2
(proxy_host) lib/proxy_host_web/endpoint.ex:1: ProxyHostWeb.Endpoint.call/2
(phoenix) lib/phoenix/test/conn_test.ex:235: Phoenix.ConnTest.dispatch/5
test/integration_test.exs:23: (test)
I guess I was looking at it myopically when I saw the argument error.