Rails 6.1.0版本中，xhr?()方法现在确实（终于）返回布尔值，而不再是匹配正则表达式的数值或nil。这个改变基于请求的'X-Requested-With'头是否包含'XMLHttpRequest'。在此之前，该方法返回的是匹配结果，可能导致意外的行为。这是一个关于Rails应用中处理Ajax请求的重要更新。
Update:
As of Rails 6.1.0, xhr?() does actually (finally) return a boolean value.
Original Answer:
The docs say that request.xhr?
Returns true if the “X-Requested-With” header contains “XMLHttpRequest”....
But BEWARE that
request.xhr?
returns numeric or nil values not BOOLEAN values as the docs say, in accordance with =~.
irb(main):004:0> /hay/ =~ 'haystack'
=> 0
irb(main):006:0> /stack/ =~ 'haystack'
=> 3
irb(main):005:0> /asfd/ =~ 'haystack'
=> nil
It's based on this:
# File actionpack/lib/action_dispatch/http/request.rb, line 220
def xml_http_request?
@env['HTTP_X_REQUESTED_WITH'] =~ /XMLHttpRequest/
end
so
env['HTTP_X_REQUESTED_WITH'] =~ /XMLHttpRequest/ => 0
The docs:
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