Hey Gophers! I'm working on a small project where I'm looking to support the "Forwarded" header as defined in RFC-7239[1]. For those unfamiliar, it's a standardization and unification of the "X-Forwarded-For" and "X-Forwarded-Proto" headers, among others. The simplest version of the header looks like the following:
Forwarded: for=192.0.2.1; by=192.0.2.2; proto=http My initial (naïve) thought was that I could use the mime.ParseMediaType()[2] function to parse the value of the header. This results in an error because that function is only designed to parse things like the "Content-Disposition" header (i.e., things that have a media-type before the key=value parameters). Reading RFC-7239 further, it becomes quite apparent that more complex header values are possible. You can not only have multiple Forwarded headers, but you can also have multiples of the key=value parameters within a single header-value. This means even the parameter parsing code of the mime.ParseMediaType() function isn't compatible if the request has the following (notice the comma in line 2): Forwarded: for=192.0.2.42; proto=http Forwarded: for=192.0.2.1, for=64.72.88.33 At the time of writing, RFC-7239 is in the Proposed Standard status (meaning it's ripe for implementation support). I've been doing some digging, and it doesn't seem like the stdlib of Go is capable of parsing this header in a meaningful way. Likewise, it doesn't look like anyone has tackled parsing this header as a third-party package. I wouldn't want to duplicate effort, so does anyone know if someone has built a package for parsing this header? Do you think it's a good idea to open an issue on the Go project to inquire about implementing a parser, in the "mime" package, that's capable of extracting the parameters from all "Forwarded" header values of a request? Is this a better fit for a third-party package? Cheers! -Tim [1] https://tools.ietf.org/html/rfc7239 [2] https://golang.org/pkg/mime/#ParseMediaType -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
