Body::chain method to chain two Body instances together

[joshtriplett]

Sometimes, you have two or more things that can be turned into a Body (for instance, a String and a Read instance), and you want to chain them together. I'd love to have a direct method to chain these together (which could delegate to Read::chain).

[jbr]

Would Body::from_string(&my_string).chain(Body::from_reader(&stdin, None)) really be preferable to Body::from_reader(Cursor::new(&my_string).chain(&stdin), None)?

[joshtriplett]

Yes, not least of which because it's possible to get the lengths right if known.

http-rs/http-types#342

[joshtriplett]

This is now merged in http-types. It'll be available in tide when tide migrates to the new version of http-types.