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Subproviders
-----------
A few useful subproviders.
## Installation
```
npm install @0xproject/subproviders --save
```
## Subproviders
#### Ledger Nano S subprovider
A subprovider that enables your dApp to send signing requests to a user's Ledger Nano S hardware wallet. These can be requests to sign transactions or messages.
#### Redundant RPC subprovider
A subprovider which attempts to send an RPC call to a list of RPC endpoints sequentially, until one of them returns a successful response.
#### Injected Web3 subprovider
A subprovider that relays all signing related requests to a particular provider (in our case the provider injected onto the web page), while sending all other requests to a different provider (perhaps your own backing Ethereum node or Infura).
### Integration tests
In order to run the integration tests, make sure you have a Ledger Nano S available.
- Plug it into your computer
- Unlock the device
- Open the on-device Ethereum app
- Make sure "browser support" is disabled
Then run:
```
yarn test:integration
```
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