请看这里： Sinatra OPTIONS HTTP动词。它现在在sinatra中实现了，所以你不必在它周围进行破解。

Have a look at this question here: Sinatra OPTIONS HTTP Verb. It's implemented in sinatra now so you don't have to hack around it.

如果这无助于看看这篇博文：与Sinatra的跨源资源共享及其在github的回购： sinatra-corss_origin

If that doesn't help take a look at this blog post: Cross Origin Resource Sharing with Sinatra, and its repo at github: sinatra-corss_origin

虽然最简单的做法应该是加上这个：

Although the simplest way to do it should work just by adding this:

response['Access-Control-Allow-Origin'] = 'http://whatever.org'

在路线中的返回值之前。

before the return value in your route.