Middy http-header-normalizer middleware

HTTP header normalizer middleware for the middy framework, the stylish Node.js middleware engine for AWS Lambda
This middleware normalizes HTTP header names to their canonical format. Very useful if clients are
not using the canonical names of header (e.g. content-type
as opposed to Content-Type
).
API Gateway does not perform any normalization, so the headers are propagated to Lambda exactly as they were sent by the client.
Other middlewares like jsonBodyParser
or urlEncodeBodyParser
will rely on headers to be in the canonical format, so if you want to support non-normalized headers in your
app you have to use this middleware before those ones.
This middleware will copy the original headers in event.rawHeaders
.
Install
To install this middleware you can use NPM:
npm install --save @middy/http-header-normalizer
Options
normalizeHeaderKey
(function) (optional): a function that accepts an header name as a parameter and returns its canonical representation.canonical
(bool) (optional): if true, modifies the headers to canonical format, otherwise the headers are normalized to lowercase (defaultfalse
)
Sample usage
const middy = require('@middy/core')
const httpHeaderNormalizer = require('@middy/http-header-normalizer')
const handler = middy((event, context, cb) => {
cb(null, {})
})
handler
.use(httpHeaderNormalizer())
Middy documentation and examples
For more documentation and examples, refers to the main Middy monorepo on GitHub or Middy official website.
Contributing
Everyone is very welcome to contribute to this repository. Feel free to raise issues or to submit Pull Requests.
License
Licensed under MIT License. Copyright (c) 2017-2018 Luciano Mammino and the Middy team.