Based on where we are at the moment - which is dealing with HTTPVersion as
a separate type - it sounds like we're converging on using a struct. As
such if there's no strong objection I'll merge the PR as-is.
That doesn't close down the conversation with respect to what we
could/should do for HTTP/2 - just spins it off separately.
Chris
To: Tanner Nelson <tanner@vapor.codes>
Cc: Paulo Faria via swift-server-dev <swift-server-dev@swift.org>
Date: 14/06/2017 15:19
Subject: Re: [swift-server-dev] Convert HTTPVersion to struct
Sent by: swift-server-dev-bounces@swift.org
So are we going to write our own http parser?
If not, I don’t see the benefit of ditching version and method
properties since both major/minor version and method are given by
the http_parser, and users are expecting to find it in the property
since these components are well defined in RFC and guaranteed its
existence in a proper http req/res. Hence they deserve to be an
independent property.
On the other hand, there’s no one guarantee the existence of
Content-Type and Content-Length etc header exists in HTTP protocol
(I can be wrong).
Michael.
> 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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···
swift-server-dev-bounces@swift.org wrote on 14/06/2017 14:41:48: > From: Michael Chiu via swift-server-dev <swift-server-dev@swift.org>
On Jun 14, 2017, at 6:27 AM, 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: