Content-Length calculation causing HTML to be truncated

[brucruz]

Hello,

I have noticed that my app (GlobalDIal) receives truncated HTML when rendering any page on the development environment.

• Version used: hotwire-spark (0.1.13)

I believe this is due to the current implementation of the "Content-Length" header in Hotwire::Spark::Middleware.

class Hotwire::Spark::Middleware
...

  def call(env)
      ...

      headers["Content-Length"] = html.bytesize.to_s if html
      response = [ html ]
    end

I could not yet find a reason why .bytesize method is not calculating the content length correctly, but I executed two tests that confirm the calculation is not correct:

1. disabled hotwire-spark in my local development
2. removed the "Content-Length" header from the response coming from the middleware and letting Rack provide that calculation to the response.

In both cases, the truncating problem was fixed.

My implementation then became:

class Hotwire::Spark::Middleware
...

  def call(env)
      ...

      headers.delete("Content-Length"])
      response = [ html ]
    end

Is anyone else facing similar issues? I opened a Pull Request to address this change and I hope it can help anyone else that might be facing the same situation.