This commit introduces a cookie store / session support
for both the async and the sync client.
Functionality is based on the cookie crate,
which provides a HTTP cookie abstraction,
and the cookie_store crate which provides a
store that handles cookie storage and url/expiration
based cookie resolution for requests.
Changes:
* adds new private dependencies: time, cookie, cookie_store
* a new cookie module which provides wrapper types around
the dependency crates
* a Response::cookies() accessor for iterating over response cookies
* a ClientBuilder::cookie_store() method that enables session functionality
* addition of a cookie_store member to the async client
* injecting request cookies and persisting response cookies
* cookie tests
NOTE: this commit DOES NOT expose the CookieStore itself,
limiting available functionality.
This is desirable, but omitted for now due to API considerations that should be fleshed out in the future.
This means users do not have direct access to the cookie session for now.
This adds an implementation to convert a `Response` type from the `http`
crate to the `async_impl::Response` type. This is the first step to
allow us to convert `http::Response` objects to `request::Response`
objects
This also adds an extension trait for the `http::response::Builder`
type. The `http::Response` object does not provide a way to access the
"final" url that the response is derived from, so we can't easily
provide that in the `From<http::Response>` implementation. For users who
are manually constructing `http::Response` objects for use in tests,
etc, they can import this extension trait, which adds a `.url()` builder
method that will allow them to pass a `Url`, which we then convert to
our newtype'd Url and add to the `http::Response`'s `extensions`. Then,
when converting from `http::Response` to `async_impl::Response` we can
pull that value out of the `extensions` and use it to construct the
`async_impl::Response`
Closes#333
