Having the HTTPVersion as a struct allows it to be serialized in the
request/response line in HTTP 1.1 and in the headers section in HTTP 2.0
with no problems. I don't see a problem with the current implementation for
HTTP 2.0.
GET / HTTP/1.1
Host: server.example.com
Connection: Upgrade, HTTP2-Settings
Upgrade: h2c
HTTP2-Settings: <base64url encoding of HTTP/2 SETTINGS payload>
HTTP/1.1 101 Switching Protocols
Connection: Upgrade
Upgrade: h2c
this is an upgrade from HTTP 1.1 to HTTP 2.0.. the first request and
response are HTTP 1.1 requests where the version goes in the
request/response line. The upgrade headers are an entirely different issue.
If we're not upgrading and creating an HTTP 2.0 request directly. The
version of the HTTPRequest type will be used to serialize the type
accordingly. How you're going to use that info is not directly related to
where it will be stored or how it will be serialized. It's just a piece of
information that's important for that type. Therefore I don't see an issue
with the current implementation when it comes to HTTP 2.0.
···
On 14 June 2017 at 10:27, Tanner Nelson via swift-server-dev < swift-server-dev@swift.org> wrote:
On Wed, Jun 14, 2017 at 2:11 PM Helge Heß via swift-server-dev < > swift-server-dev@swift.org> wrote:
On 14 Jun 2017, at 14:59, Paulo Faria <paulo@zewo.io> wrote:
> You're completely right we should care about HTTP 2.0 now. But let's do
it one step at a time, or else we won't get things done. The current topic
is the HTTPVersion type. So could you please give your feedback in the
HTTPVersion thread about how the current proposal of HTTPversion fits with
HTTP 2.0? We should go from lower abstractions to higher abstractions
incrementally but definitely considering the upper abstractions. Let's keep
focus and move on!I gave my feedback on the type in the this thread already. Struct is fine
for me, tuple is OK too. I don’t actually care much as “The HTTP version
should only matter for logging purposes”. If it comes with comparison
operations and such, something is likely wrong with the API.The only HTTP/2 specific note I have is this thing:
From the HTTPRequest API design perspective there is a small
change in that method/version are just headers in HTTP/2.
I brought that up before.
E.g. why does ‘method' deserve a special enum, but not
content-type etc which is equally important for dispatching
a request. Either approach is fine though.)In that case, maybe we ditch the version and method properties in favor of
something more generic like:(just spitballing some pseudo swift here)
struct Request { ... enum Metadata { case original(major: Int, minor: Int, Method) case headers } var metadata: Metadata ... } extension Request { var method: Method { switch metadata { case .original(_, _, let method): return method case .headers: return Method(rawValue: headers["Method"]) } } }
Here an enum's ability to exhaustively switch would be useful. Then
`req.method` is implemented as an extension similar to how `req.version`
and `req.contentType` could be implemented.This affects the discussion as it may make sense to expose the
HTTPVersion as a regular header to mirror the new HTTP/2 setup
instead of basing the API on the old HTTP/0,1 model.
(I think either is fine, with a slight preference for going
with the ‘future’)Or in other words: Why struct or tuple, just keep it as a string
like the other headers.If HTTPVersion is not exposed as a String but as a specific type,
that would then affect the way headers in general are handled
(and I’m very much in favour of NOT using strings for the common
ones for various reasons).hh
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