diff options
Diffstat (limited to 'content/blog/2023/http-headers-in-rails-hyphens-and-underscores.md')
| -rw-r--r-- | content/blog/2023/http-headers-in-rails-hyphens-and-underscores.md | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/content/blog/2023/http-headers-in-rails-hyphens-and-underscores.md b/content/blog/2023/http-headers-in-rails-hyphens-and-underscores.md new file mode 100644 index 0000000..f872ebc --- /dev/null +++ b/content/blog/2023/http-headers-in-rails-hyphens-and-underscores.md @@ -0,0 +1,22 @@ +--- +title: "HTTP Headers in Rails: Hyphens, Underscores, and a terrible day" +category: engineering +abstract: Rack modyfies incomming requests's headers! +date: 2023-02-01T18:00:51+01:00 +year: 2023 +draft: false +tags: +- rack +- Ruby-on-Rails +- headers +- magic +--- +Everyone's favorite magician, Ruby on Rails, does it again. + +As it turns out, [Rack modifies incoming requests' headers](https://github.com/rails/rails/blob/aaf7bed00338c3a97dbb12b3c82a30ae34e67876/actionpack/lib/action_dispatch/http/headers.rb#L12) and normalizes they keys. So, every time the client/proxy sends something cool like `A-HEADER`, the key is modified, so some characters become underscore. Therefore in Rails code need to access `A_HEADER`, and if I had known that yesterday, my day would be much more pleasant. + +> Also note that when headers are mapped to CGI-like variables by the Rack +> +> server, both dashes and underscores are converted to underscores. +> +> (as [per documentation](https://github.com/rails/rails/blob/aaf7bed00338c3a97dbb12b3c82a30ae34e67876/actionpack/lib/action_dispatch/http/headers.rb#L12) |