CapabilitiesApi (client-server-api 0.9.0 API)

```
@Path("/_matrix/client/r0")
@Produces("application/json")
public interface CapabilitiesApi
```
A homeserver may not support certain operations and clients must be able to query for what the homeserver can and can't offer. For example, a homeserver may not support users changing their password as it is configured to perform authentication against an external system.

Method Summary

Modifier and Type	Method	Description
`void`	`capabilities(javax.ws.rs.core.UriInfo uriInfo, javax.ws.rs.core.HttpHeaders httpHeaders, javax.ws.rs.container.AsyncResponse asyncResponse)`	Gets information about the server's supported feature set and other relevant capabilities.

- Method Detail
  - capabilities
```
@GET
@Path("/")
void capabilities(@Context
                  javax.ws.rs.core.UriInfo uriInfo,
                  @Context
                  javax.ws.rs.core.HttpHeaders httpHeaders,
                  @Suspended
                  javax.ws.rs.container.AsyncResponse asyncResponse)
```
    Gets information about the server's supported feature set and other relevant capabilities.
    Requires auth: Yes.
    Rate-limited: Yes.
    Return: CapabilitiesResponse.
    Status code 200: The capabilities of the server.
    
    Status code 429: This request was rate-limited.
    
    Parameters:
    
    uriInfo - Request Information.
    
    httpHeaders - Http headers.
    
    asyncResponse - Asynchronous response.