HTTP's error pages

One day you may want to replace the standard error pages of your HTTP server with something more original and pretty. That's what this repository was created for :) It contains:

Simple error pages generator, written on Go
Single-page error page templates with different designs (located in the templates directory)
Fast and lightweight HTTP server
Already generated error pages (sources can be found here, the demonstration is always accessible here)

🔥 Features list

HTTP server written on Go, with the extremely fast FastHTTP under the hood
- Respects the Content-Type HTTP header (and X-Format) value and responds with the corresponding format (supported formats is json and xml)
- Writes logs in json format
- Contains healthcheck endpoint (/healthz)
- Contains metrics endpoint (/metrics) in Prometheus format
Lightweight docker image (~3.7Mb compressed size), distroless and uses the unleveled user by default
Go-template tags are allowed in the templates
Ready for integration with Traefik (error pages customization) and Ingress-nginx
Fully configurable (take a look at the configuration file and project Wiki)
Distributed using docker image and compiled binary files

🧩 Install

Download the latest binary file for your os/arch from the releases page or use our docker image:

Registry	Image
Docker Hub	`tarampampam/error-pages`
GitHub Container Registry	`ghcr.io/tarampampam/error-pages`

Using the latest tag for the docker image is highly discouraged because of possible backward-incompatible changes during major upgrades. Please, use tags in X.Y.Z format

🛠 Usage

Please, take a look at our Wiki for the common usage stories:

HTTP server (routes, formats, flags and environment variables)
Pages generator (build your own error page set)
Static error pages (extract generated static error pages from the docker image)
Usage with nginx (include our error pages into an image with nginx)
Usage with Traefik and local Docker Compose (it's a good starting point for the tests)
Usage with Traefik and Docker Swarm
Kubernetes & ingress nginx

🦾 Performance

Used hardware:

Intel® Core™ i7-10510U CPU @ 1.80GHz × 8
16 GiB RAM

$ ulimit -aH | grep file
-f: file size (blocks)              unlimited
-c: core file size (blocks)         unlimited
-n: file descriptors                1048576
-x: file locks                      unlimited

$ wrk --version | head -n 1
wrk 4.2.0 [epoll] Copyright (C) 2012 Will Glozer

$ wrk -t12 -c400 -d30s http://127.0.0.1:8080/500.html
Running 30s test @ http://127.0.0.1:8080/500.html
  12 threads and 400 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    50.06ms   61.15ms 655.79ms   85.54%
    Req/Sec     1.07k   363.14     2.40k    69.24%
  383014 requests in 30.08s, 2.14GB read
Requests/sec:  12731.07
Transfer/sec:     72.79MB