Outbound HTTP

[itowlson]

There is probably more to do on this but it's not fully working right now... grin I understand Python and JS are not changing on day one, and will likely get support via componentise-blah tools rather than the current plugins; I am not 100% sure about Go but guess it is staying the same for now...?

Content must go through a pre-merge checklist.

Pre-Merge Content Checklist

This documentation has been checked to ensure that:

• The title, template, and date` are all set
• Does this PR have a new menu item (anywhere in templates/*.hbs files) that points to a document .md that is set to publish in the future? If so please only publish the .md and .hbs changes in real-time (otherwise there will be a menu item pointing to a .md file that does not exist)
• File does not use CRLF, but uses plain LF (hint: use cat -ve <filename> | grep '^M' | wc -l and expect 0 as a result)
• Has passed bart check

✅ content/spin/v2/http-outbound.md
✅ content/spin/v2/rust-components.md

• Has been manually tested by running in Spin/Bartholomew (hint: use PREVIEW_MODE=1 and run npm run styles to update styling)

• Headings are using Title Case
• Code blocks have the programming language set to properly highlight syntax and the proper copy directive
• Have tested with npm run test and resolved all errors

• Relates to an existing (potentially outdated) blog article? If so please add URL in blog to point to this content.

[lann]

I'm proposing a simplification of this interface: fermyon/spin#1977

Feel free to veto it into >2.0.0, though note that the code here would still work either way so it could just be a post-release docs update.

[tpmccallum]

LGTM

[itowlson]

We will need to revisit this as final changes stabilise in Spin main, but merging for now after discussion with @tpmccallum so that we minimise the number of merge conflicts in waiting long-running PRs.