# HTTPlug Discovery
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[](https://packagist.org/packages/php-http/discovery)
**This library provides auto-discovery and auto-installation of well-known PSR-17, PSR-18 and HTTPlug implementations.**
## Install
Via Composer
``` bash
composer require php-http/discovery
```
## Usage as a library author
Please see the [official documentation](http://php-http.readthedocs.org/en/latest/discovery.html).
If your library/SDK needs a PSR-18 client, here is a quick example.
First, you need to install a PSR-18 client and a PSR-17 factory implementations.
This should be done only for dev dependencies as you don't want to force a
specific implementation on your users:
```bash
composer require --dev symfony/http-client
composer require --dev nyholm/psr7
```
Then, you can disable the Composer plugin embeded in `php-http/discovery`
because you just installed the dev dependencies you need for testing:
```bash
composer config allow-plugins.php-http/discovery false
```
Finally, you need to require `php-http/discovery` and the generic implementations
that your library is going to need:
```bash
composer require 'php-http/discovery:^1.17'
composer require 'psr/http-client-implementation:*'
composer require 'psr/http-factory-implementation:*'
```
Now, you're ready to make an HTTP request:
```php
use Http\Discovery\Psr18Client;
$client = new Psr18Client();
$request = $client->createRequest('GET', 'https://example.com');
$response = $client->sendRequest($request);
```
Internally, this code will use whatever PSR-7, PSR-17 and PSR-18 implementations
that your users have installed.
## Usage as a library user
If you use a library/SDK that requires `php-http/discovery`, you can configure
the auto-discovery mechanism to use a specific implementation when many are
available in your project.
For example, if you have both `nyholm/psr7` and `guzzlehttp/guzzle` in your
project, you can tell `php-http/discovery` to use `guzzlehttp/guzzle` instead of
`nyholm/psr7` by running the following command:
```bash
composer config extra.discovery.psr/http-factory-implementation GuzzleHttp\\Psr7\\HttpFactory
```
This will update your `composer.json` file to add the following configuration:
```json
{
"extra": {
"discovery": {
"psr/http-factory-implementation": "GuzzleHttp\\Psr7\\HttpFactory"
}
}
}
```
Don't forget to run `composer install` to apply the changes, and ensure that
the composer plugin is enabled:
```bash
composer config allow-plugins.php-http/discovery true
composer install
```
## Testing
``` bash
composer test
```
## Contributing
Please see our [contributing guide](http://docs.php-http.org/en/latest/development/contributing.html).
## Security
If you discover any security related issues, please contact us at [security@php-http.org](mailto:security@php-http.org).
## License
The MIT License (MIT). Please see [License File](LICENSE) for more information.
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