pretender

A naive HTTP mock server with sequential responses from a file.

❯ bin/pretender

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• starting server on port 8080
• using responses file: examples/example.json
• press ctrl+c to stop

Install

With go install

go install github.com/kilianc/pretender/cmd/pretender@v1.7.0

With docker

docker run --rm -it \
  -p 8080:8080 \
  -v $(pwd)/examples:/examples \
  kilianciuffolo/pretender:v1.7.0 --responses /examples/example.json

With curl

export CURRENT_OS=$(uname -s | tr A-Z a-z)
export CURRENT_ARCH=$(uname -m | tr A-Z a-z | sed s/x86_64/amd64/)
export TARGZ_NAME="pretender-${CURRENT_OS}-${CURRENT_ARCH}.tar.gz"
export TARGZ_URL="https://github.com/kilianc/pretender/releases/download/v1.7.0/${TARGZ_NAME}"

curl -sOL ${TARGZ_URL}
tar -xzf ${TARGZ_NAME}

echo "successfully downloaded pretender $(./pretender --version)"

Usage

Every response in examples/example.json will match one consecutive http response when hitting http://localhost:8080

pretender --port 8080 --responses examples/example.json

The server has a default /healthz endpoint that responds with a 200. If this conflicts with your mock responses, it is possible to configure it by setting the PRETENDER_HEALTH_CHECK_PATH environment variable.

PRETENDER_HEALTH_CHECK_PATH=/alive pretender

Responses File

Both plain text and JSON formats are supported.

A TEXT file contains one response per line:

This line is the first text/plain response body with 200 status code
This line is the second text/plain response body with 200 status code

A JSON file allows more flexibility and controls:

[
  {
    "status_code": 200,
    "body": "hello",
    "headers": {"content-type":"text/plain"},
    "delay_ms": 1000,
    "repeat": 5
  },
  {
    "body": {
      "hello": "world"
    },
    "headers": {"Content-Type":"application/json"}
  },
  // ...
  {
    "body": "will repeat forever",
    "repeat": -1
  }
]

A valid response definition can contain the following fields

name	description	default
status_code	HTTP status code	200
body	HTTP response body	""
headers	HTTP headers	{"content-type":"text/plain"}
delay_ms	Number of ms to wait before responding	0
repeat	Number of times the response repeats or -1 for ∞	1

Local Development

These are the usual suspects

make run
make build
make test
make cover

After running make build the binary available in the bin/ folder

bin/pretender --port 8080 --responses examples/example.json

Docker

If you prefer to build and run pretender in a docker container, just on of these commands

make docker-build
make docker-run

License

MIT License, see LICENSE