* pkg/web: closure-style middlewares
Switches the middleware execution model from web.Handlers in a slice to
web.Middleware.
Middlewares are temporarily kept in a slice to preserve ordering, but
prior to execution they are applied, forming a giant call-stack, giving
granular control over the execution flow.
* pkg/middleware: adapt to web.Middleware
* pkg/middleware/recovery: use c.Req over req
c.Req gets updated by future handlers, while req stays static.
The current recovery implementation needs this newer information
* pkg/web: correct middleware ordering
* pkg/webtest: adapt middleware
* pkg/web/hack: set w and r onto web.Context
By adopting std middlewares, it may happen they invoke next(w,r) without
putting their modified w,r into the web.Context, leading old-style
handlers to operate on outdated fields.
pkg/web now takes care of this
* pkg/middleware: selectively use future context
* pkg/web: accept closure-style on Use()
* webtest: Middleware testing
adds a utility function to web/webtest to obtain a http.ResponseWriter,
http.Request and http.Handler the same as a middleware that runs would receive
* *: cleanup
* pkg/web: don't wrap Middleware from Router
* pkg/web: require chain to write response
* *: remove temp files
* webtest: don't require chain write
* *: cleanup
* pkg/web: store http.Handler internally
* pkg/web: remove injection
Removes any injection code from pkg/web.
It already was no longer functional, as we already only injected into
`http.Handler`, meaning we only inject ctx.Req and ctx.Resp.
Any other types (*Context, *ReqContext) were already accessed using the
http.Request.Context.Value() method.
* *: remove type mappings
Removes any call to the previously removed TypeMapper, as those were
non-functional already.
* pkg/web: remove Context.Invoke
was no longer used outside of pkg/web and also no longer functional
It is conventionally common for the X-Forwarded-For header to contain a
comma-separated list of IP addresses, with each intermediate proxy
adding an additional item as a request passes through it. This change
makes the web framework handle this case appropriately, always selecting
the first item in the list.
