Producing Content-Length 0 Responses in Rails

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Returning a blank response in Ruby on Rails is trickier than we first imagined. For instance, we thought that either one of these two methods would suffice:

render text: nil
render nothing: true

But they don’t. Both of these methods result in a response with a Content-Length value of 1. What’s the content? A single hex character of 20, which represents a single whitespace character.

We played around with a few other options and found that this is the most straightforward method to provide a truly blank response:

render text: ''

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