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This Handler option is used it to allow/deny request by their method.

The API is an RPC API so it normally should only work with PUT, but we also
use a read-only, GET-based partial API that runs with the gateway.

This commit makes the actual allowed (or handled) methods configurable.

A test is added, and test facilities improved to be able to set/modify
this option.

This:

1. Ensures the correct content type.
2. Tells browsers not to sniff the content type.

This prevents any nasties from happening...

CloseNotifier has been deprecated for a while.

Also, ditch the "environment" context. We don't actually _need_ this.

We can't stream a response while reading a body *unless* we've configured the
connection to close after we're done sending a response.

This patch works around that issue by doing exactly that.

Only use custom encoders for values.

fixes #65

Also, remove SetEncoder. Always derive the correct encoder from the request.

**Returning errors/calling:**

Instead of having a dance where we:
  * Close the response emitter immediately if the command succeeds.
  * Return an error, call SetError, and then close the response emitter if it
    fails.

Just set the error from within the `Call` command and always close the response
emitter.

**Doner**

Get rid of the Done channel/doner interface from the response emitter. We close
the response emitter after finishing the Call *anyways* so this channel isn't
necessary (anymore, at least).

Instead, handle it at the boundaries (in ServeHTTP and the CLI's Run function).
This ensures that we actually *wait* to finish writing everything before
canceling the context.

We *always* expect environments to be able to return a context so we might as
well enforce this with the type system.

Every log event resulting from a command will have a uuid associated with it.
Copied from go-ipfs#4392.

Source: https://github.com/ipfs/go-ipfs/commit/b4eeff2d84447eb367360a5b4adef16188a32a27

- made Response.Request() return Request not *Request
- added ResponseEmitter.Tee()
- added a wrapper that wraps a Response and provides an oldcmds.Response

this way we can share the code with the legace commands package and don't have to convert everything

Revert "http api: makes sure header is sent even when r is not ready yet. fixes #3304 (#3305)"
This reverts commit 68d8a298c58ed950bd44118cc5e6d1ffc2def395.

License: MIT
Signed-off-by: Jan Winkelmann <j-winkelmann@tuhh.de>

* http api: send header even when r is not ready yet. fixes #3304

License: MIT
Signed-off-by: Jan Winkelmann <j-winkelmann@tuhh.de>

* http api: check flush error and only flush once per iteration

License: MIT
Signed-off-by: Jan Winkelmann <j-winkelmann@tuhh.de>

* http api: f.Flush is not in fact returning anything

License: MIT
Signed-off-by: Jan Winkelmann <j-winkelmann@tuhh.de>

* api http: remove pointless Flush

License: MIT
Signed-off-by: Jan Winkelmann <j-winkelmann@tuhh.de>

License: MIT
Signed-off-by: Jeromy <why@ipfs.io>

License: MIT
Signed-off-by: Jeromy <why@ipfs.io>

* Update golog in go-ipfs

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

* Update go-libp2p for go-log

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

* Update go-libp2p-secio for go-log

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

* Update go-libp2p-crypto for go-log

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

* Update go-libp2p-peer for go-log

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

* Import peersore, it wasn't imported

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

* Update peerstore

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

* Update peer

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

* Update secio

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

* Update go-libp2p

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>

According to golang standards, these should not be capitalized nor having a trailing period, AFAIK.

License: MIT
Signed-off-by: Richard Littauer <richard.littauer@gmail.com>