This page links to a summary. The source article is at <a href="http://blog.parse.com/learn/how-we-moved-our-api-from-ruby-to-go-and-saved-our-sanity/" rel="nofollow">http://blog.parse.com/learn/how-we-moved-our-api-from-ruby-t...</a> .<p>The saddest part, and an example of why I think Postel's Robustness principle is not useful, is:<p>> The hardest part of the rewrite was dealing with all the undocumented behaviors and magical mystery bits that you get with Rails middleware. Parse exposes a REST API, and Rails HTTP processing is built on a philosophy of “be liberal in what you accept”. So developers end up inadvertently sending API requests that are undocumented or even non-RFC compliant … but Rails middleware cleans them up and handles it fine.