t".Request).{Do,DoRaw,Stream,Watch}` now require callers to pass a `context.Context` as an argument. The context is used for timeout and cancellation signaling and to pass supplementary information to round trippers in the wrapped transport chain. If you don't need any of this functionality, it is sufficient to pass a context created with `context.Background()` to these functions. The `(*"k8s.io/client-go/rest".Request).Context` method is removed now that all methods that execute a request accept...

function and method <a href="#Calls">calls</a> and
<a href="#Receive_operator">receive operations</a>
can appear in statement context. Such statements may be parenthesized.
</p>

<pre class="ebnf">
ExpressionStmt = Expression .
</pre>

<p>
The following built-in functions are not permitted in statement context:
</p>

<pre>
append cap complex imag len make new real

([#62695](https://github.com/kubernetes/kubernetes/pull/62695), [@CaoShuFeng](https://github.com/CaoShuFeng))
* HTTP transport now uses `context.Context` to cancel dial operations. k8s.io/client-go/transport/Config struct has been updated to accept a function with a `context.Context` parameter. This is a breaking change if you use this field in your code. ([#60012](https://github.com/kubernetes/kubernetes/pull/60012), [@ash2k](https://github.com/ash2k))

- K8s.io/apimachinery/pkg/util/runtime: Added support for new calls to handle panics and errors in the context where they occur. `PanicHandlers` and `ErrorHandlers` now must accept a context parameter for that. Log output is structured instead of unstructured. ([#121970](https://github.com/kubernetes/kubernetes/pull/121970), [@pohly](https://github.com/pohly)) [SIG API Machinery and Instrumentation]...

- Callers of `wait.ExponentialBackoffWithContext` now must pass a `ConditionWithContextFunc` to be consistent with the signature and avoid creating a duplicate context. If your condition does not need a context you can use the `ConditionFunc.WithContext()` helper to ignore the context, or use `ExponentialBackoff` directly. ([#115113](https://github.com/kubernetes/kubernetes/pull/115113), [@smarterclayton](https://github.com/smarterclayton))

* Support context completion for kubectl config use-context ([#42336](https://github.com/kubernetes/kubernetes/pull/42336), [@superbrothers](https://github.com/superbrothers))
* print warning when delete current context ([#42538](https://github.com/kubernetes/kubernetes/pull/42538), [@adohe](https://github.com/adohe))

pkg net/http, func NewRequestWithContext(context.Context, string, string, io.Reader) (*Request, error)
pkg net/http, method (Header) Clone() Header
pkg net/http, method (*Request) Clone(context.Context) *Request
pkg net/http, method (*Transport) Clone() *Transport
pkg net/http, type Server struct, BaseContext func(net.Listener) context.Context
pkg net/http, type Server struct, ConnContext func(context.Context, net.Conn) context.Context

- `kubectl config set-context` can now set attributes of the current context, such as the current namespace, by passing `--current` instead of a specific context name ([#66140](https://github.com/kubernetes/kubernetes/pull/66140), [@liggitt](https://github.com/liggitt))

- github.com/d2g/dhcp4client: [6e570ed](https://github.com/d2g/dhcp4client/tree/6e570ed)
- github.com/jteeuwen/go-bindata: [a0ff256](https://github.com/jteeuwen/go-bindata/tree/a0ff256)
- github.com/kardianos/osext: [8fef92e](https://github.com/kardianos/osext/tree/8fef92e)
- github.com/kr/fs: [2788f0d](https://github.com/kr/fs/tree/2788f0d)
- github.com/marstr/guid: [8bdf7d1](https://github.com/marstr/guid/tree/8bdf7d1)

- Client-side apply will now use OpenAPI `v3` by default. ([#120707](https://github.com/kubernetes/kubernetes/pull/120707), [@Jefftree](https://github.com/Jefftree))
- Decoding etcd's response now respects the timeout context. ([#121614](https://github.com/kubernetes/kubernetes/pull/121614), [@HirazawaUi](https://github.com/HirazawaUi))