http-log-proxy

Simple proxy service which logs request/response objects in detail as clean json.

• Useful for intercepting traffic and debug requests if you can remap the DNS
• Service tries to leave original requests & responses unchanged
• Supports HTTP/HTTPS target endpoints
• Clean logging for text, json and binary body content
• Can output to console/stdout, file or tcp socket

Performance: does around 1000 requests/s on a 2,8 GHz Intel Core i5 single thread, peaks at 75MB ram. Response body < 1kb.

Usage

docker run --rm -it -p 9000:9000 -e TARGET="https://ifconfig.co" roelb/http-log-proxy

or

npm install
TARGET="https://ifconfig.co" node proxy.js

You can now send requests to 127.0.0.1:9000 and see request/response log output.

Example output for curl 127.0.0.1:9000 with PRETTY=true:

{
  "@timestamp": "2019-01-19T19:45:28.965Z",
  "request": {
    "headers": {
      "host": "127.0.0.1:9000",
      "user-agent": "curl/7.54.0",
      "accept": "*/*"
    },
    "httpVersion": "1.1",
    "url": "/",
    "upgrade": false,
    "method": "GET"
  },
  "response": {
    "headers": {
      "date": "Sat, 19 Jan 2019 19:45:28 GMT",
      "content-type": "text/plain; charset=utf-8",
      "content-length": "15",
      "connection": "close",
      "set-cookie": [
        "__cfduid=d3ef70f7ade076b2c8dje5327371a77ad1547927128; expires=Sun, 19-Jan-20 19:45:28 GMT; path=/; domain=.ifconfig.co; HttpOnly"
      ],
      "via": "1.1 vegur",
      "expect-ct": "max-age=604800, report-uri=\"https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct\"",
      "server": "cloudflare",
      "cf-ray": "49bbdieu580ec77b-AMS"
    },
    "httpVersion": "1.1",
    "statusCode": 200,
    "statusMessage": "OK",
    "bodyLength": 15,
    "body": "92.217.134.121\n"
  }
}

Configuration

Service config variables

Variable	Possible value
TARGET	Set to URL you want to forward requests to. HTTP or HTTPS. Required.
PORT	Port for the service to listen on. Default: 9000
MAX_BODY_SIZE	Max body size. Default: 50mb
DISABLE_LOG	Disable logging to leverage proxy capabilities only. Default: false
OUTPUT	Output channel to write json to. Default: stdout.

Possible OUTPUT configs

Output	Possible value
stdout	Write new lines to process.stdout
stderr	Write new lines to process.stderr
tcp:host:port	Write new lines to TCP service. Reconnects automatically. Can drop messages when connection is failing.
file:filepath:50:5	Write new lines to filepath pattern and rotate files every 50mb while keeping last 5 files. Files are written with YYYYMMDDHHmmssSSS.log appended to them. Use / separator. Example for filepath /tmp/servicelogs-: /tmp/servicelogs-20190119143000000.log

Logging output styling

Variable	Possible value
PRETTY	Set to true for pretty console output. Default: false (one line for every request)
REQ_BODY	Set to false to disable request body logging. Default: true
RES_BODY	Set to false to disable response body logging. Default: true
REQ_DECODE_JSON	Set to true to decode json body in the log. Default: false
RES_DECODE_JSON	Set to true to decode json body in the log. Default: false
REQ_BINARY_BODY_B64	Set to true to encode request binary content to base64. Default: false (false: body not logged)
RES_BINARY_BODY_B64	Set to true to encode response binary content to base64. Default: false (false: body not logged)

Dependencies

• This service leverages node-http-proxy under the hood.

License

The MIT License (MIT)

Copyright (c) 2019 Roel Berger & the Contributors.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.