Content-Length should be added when possible
Reported by Dan Kubb (dkubb) | July 18th, 2008 @ 03:39 PM | in Future
Right now, if the Content-Length isn't provided to Thin, it will pass the request through to the client as-is.
In my case Merb does not automatically add the Content-Length when using HAML (although this could affect ERB and other templating systems, I haven't checked).
If the body were a String or an Array, it would be relatively inexpensive to calculate the Content-Length and include it in the response. This would help in situations where the client has requested keep-alive, but the framework doesn't set Content-Length.
In certain cases, the Content-Length should not be automatically added:
- When the Status code is 1xx, 204 or 304
- When the Transfer-Encoding header is set to chunked
- When the body is neither a String or an Array
Also, I'm not entirely sure about this, but perhaps the Rack guys should be asked to include a test in Rack::Lint to ensure the Content-Length is set by the framework unless one of the above conditions is met.
Comments and changes to this ticket
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Dan Kubb (dkubb) July 18th, 2008 @ 03:51 PM
I just sent a pull request to macournoyer for the following commit on my fork (dkubb/thin):
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macournoyer July 19th, 2008 @ 10:13 AM
- State changed from “new” to “resolved”
(from [affccc93679a419c8fca2f92fc11e006687bdf15]) Add Content-Length header to response automatically when possible [#74 state:resolved]
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Dan Kubb (dkubb) July 19th, 2008 @ 11:26 AM
@macournoyer: As a side note, do you think Rack::Lint should be updated to ensure the framework either sets Content-Length or Transfer-Encoding: chunked on its own? I think perhaps that should be the case, but I wanted to see what you thought.
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macournoyer July 19th, 2008 @ 04:23 PM
Yeah I think that should be the responsibility of the framework to set Content-Length. Since the framework built the response, it knows better how to compute de length.
So yeah, I agree that Lint should validate that the app sets it.
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Dan Kubb (dkubb)
macournoyer