check_header/README.md

Check if headers aren't invalid for correct use in setHeader or writeHead functions

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# Check Header

Code is inherit from NodeJS internal functions introduced in v0.10.42, v0.12.10, v4.3.1 and v5.6.0.

## Install

```sh
npm install --save check_header
```

## Example

```js
var checker = require('check_header');
var headersObject = {'Content-Type':'žluťoučký kůň'};
if (!checker.isValid(headersObject)) {
  console.log("Invalid header there!");
}
```