Latest #cowboy Threads 
At the heart of every Phoenix application is the often “invisible” HTTP server layer.
For over a decade Cowboy has served the community ...
New
Following has been copied from the Erlef website:
Vulnerability description
Allocation of Resources Without Limits or Throttling vulnera...
New
I’m using absinthe with absinthe-graphql-ws and cowboy + ranch + phoenix in production. Looking at LiveDashboard, I often see that there ...
New
I’m trying to use elixir from time to time and have a use case for something simpler than Phoenix (=> Cowboy).
I was wondering how pe...
New
I am working on an Phoenix API (PUT) route that allows the upload of rather large image files (more than 1gb). So I am trying to read the...
New
Optimizing WebSocket Compression in Plug Cowboy: Reducing CPU Overhead on High-Traffic Socket Server
I’m facing a peculiar challenge with a socket server I’ve built using Elixir and Cowboy WebSocket (Cowboy WebSocket documentation). This ...
New
The cause is completely unclear to me… the server will run fine for a while then the below happens. I thought it was related to the ETS s...
New
I am building some sort of a web app that is like customers support service to learn Elixir (I’m new)
I found this template: GitHub - ho...
New
On a LiveView app with 25+ million active users per month.
We are using K8s so I am going to use the word “pod”.
I have been told that ...
New
Hello
I’m trying to learn some basic Phoenix stuff by writing a backend API and I am having trouble implementing client auth via mTLS. M...
New
This Week's Trending
This Month's Trending
At the heart of every Phoenix application is the often “invisible” HTTP server layer.
For over a decade Cowboy has served the community ...
New
This Year's Trending
Following has been copied from the Erlef website:
Vulnerability description
Allocation of Resources Without Limits or Throttling vulnera...
New
I’m trying to use elixir from time to time and have a use case for something simpler than Phoenix (=> Cowboy).
I was wondering how pe...
New
Last Three Year's Trending
Shouldn’t there be something additional configurable as a reverse proxy that handles 2M connections? Especially since there are complexit...
New
I am building a simple http server using Plug.Cowboy (no Phoenix pls!) to serve a json API for a customer. A microservice.
The problem ...
New
On a LiveView app with 25+ million active users per month.
We are using K8s so I am going to use the word “pod”.
I have been told that ...
New
Hello
I’m trying to learn some basic Phoenix stuff by writing a backend API and I am having trouble implementing client auth via mTLS. M...
New
Hi! After upgrading to Phoenix 1.7 (and cowboy 2.9 to 2.10), we’re seeing a bunch of odd errors from Cowboy. We haven’t noticed any user ...
New
Optimizing WebSocket Compression in Plug Cowboy: Reducing CPU Overhead on High-Traffic Socket Server
I’m facing a peculiar challenge with a socket server I’ve built using Elixir and Cowboy WebSocket (Cowboy WebSocket documentation). This ...
New
:gun_error : {:stream_error, :protocol_error, :"Stream reset by server."}
In Phoenix. The stream ref is created, but somewhere before up...
New
I have a cowboy server that has had a normal API where I use plug, and I use plug to encode and decode the request’s user session. Howeve...
New
Hey all,
Maybe my tired eyes are just tiredly overlooking a tired tiny detail, but for all the staring and experimenting I’ve done I can...
New
I was debugging a request implementation in Phoenix with vscode. After hitting the a breakpoint and ~60 secs later, i got the following s...
New
I have made a simple static site using nimble publisher and followed along with the tut from fly.io Crafting your own Static Site Generat...
New
I am working on an Phoenix API (PUT) route that allows the upload of rather large image files (more than 1gb). So I am trying to read the...
New
I am building some sort of a web app that is like customers support service to learn Elixir (I’m new)
I found this template: GitHub - ho...
New
The cause is completely unclear to me… the server will run fine for a while then the below happens. I thought it was related to the ETS s...
New
Trending Over Three Years
I’m trying to evaluate the best combo/stack for a BEAM Web app. Right now I’m exploring Yaws a bit, after having dealt with Phoenix for a...
New
All of a sudden my app has started to crash:
$ mix phx.server
[................]
Generated my_app app
[info] Applicatio...
New
So I’ve been banging my head to the wall trying to figure out why my upstream was not being handled by phoenix.
I first checked my nginx...
New
Hi,
I have a phoenix api setup but i’ve been seeing Ranch acceptor error and im not sure if this is also causing the process to die out ...
New
Pre-info:
webserver : Cowboy only, not using nginx
My certs is from Let’s Encrypt (certbot)
Debian 8
Generated dh-param.pem file usi...
New
Well I made the old HTTP/2 thread, so I guess it’s time I should make the HTTP/3 thread, lol. ^.^;
Cloudflare has rolled out HTTP/3 sup...
New
I’ve ever heard a rumor saying that it is not recommended to expose Cowboy itself directly to the Internet. The Cowboy’s author also does...
New
So I just noticed Phoenix uses Cowboy 1.0 while version 2.0 already exists. I’m wondering if there are plans to migrate Phoenix to Cowboy...
New
We had a thread here recently that mentioned webservers in PHP, and it got me curious about the options in the BEAM world and what everyo...
New
[error] Ranch protocol :error (:cowboy_protocol) of listener UrlFetcher.Endpoint.HTTP terminated
** (exit) :undef
15:07:19.288 [error] ...
New
With the trending news that nginx has been acquired by F5 (Nginx to Be Acquired by F5 Networks | Hacker News) it sparked the natural disc...
New
I’m seeing an error when I try to run iex -S mix phx.server after a fresh mix phx.new:
○ iex -S mix phx.server
Erlang/OTP 21 [erts-10.2....
New
There was an interesting thread about Caddy 2.0 on HN yesterday with a number of people giving it high praise over even nginx.
https://n...
New
Hi,
My socket are disconnected every 60 sec when they’re not sending data.
I tried to change the idle_timeout to :infinity: (debugging...
New
So I kind of knew of this behavior and I stumbled upon it before but actually I am not sure what is the best way to solve / debug the iss...
New
- Follow
- Join
- Shape
the conversation
Latest on Elixir Forum
Get money off!
The Pragmatic Bookshelf
35% off any eBook
Manning Publications
45% off any item
ElixirCasts
10% off for life
The Pragmatic Studio
20% off any course
AppSignal
10% off for 12 months
Honeybadger
10% off for 12 months
Simply use coupon code "devtalk.com" or "elixirforum" at checkout!
Filter by Type:
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #deployment
- #library
- #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
- #blog-post
- #elixirconf-us
- #elixir-ls
- #ai
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #api
- #forms
- #hex
- #security
- #metaprogramming
Forums
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!
Practical resources that improve the lives of professional developers.
Bringing learning, work and compliance together since 1987.
**Building the future of software with AI, trust, and human connection.**
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"