## REST key-val store

Create an API with the following endpoints to create a key-value store. The purpose of the API is to store any arbitrary length value in a persistent store with respect to a key and later fetch these values by keys. These values will have a TTL (for example 5 minutes) and after the TTL is over, the values will be removed from the store.

### GET /values

Get all the values of the store.

###### response: {key1: value1, key2: value2, key3: value3...}

### GET /values?keys=key1,key2

Get one or more specific values from the store and also reset the TTL of those keys.

###### response: {key1: value1, key2: value2}

### POST /values

Save a value in the store.

###### request: {key1: value1, key2: value2..}
###### response: whatever’s appropriate

### PATCH /values

Update a value in the store and also reset the TTL.

###### request: {key1: value1, key2: value2..}
###### response: whatever’s appropriate

## Constraints

### Must be done

1. Use appropriate status codes with all the responses.
1. Values can be of arbitrary length
1. Remove all values stored over more than 5 minutes. Set a TTL.
1. Has to be FAST

### Good to have

1. Reset TTL on every GET Request.
1. Must be fault-tolerant, persistent
1. It’s a plus if you can run the service with single command
1. writing test case is also encourged if possible