Ruby on rails 如何检查给定url中是否存在图像?
这是cloudinary链接Ruby on rails 如何检查给定url中是否存在图像?,ruby-on-rails,ruby,cloudinary,Ruby On Rails,Ruby,Cloudinary,这是cloudinary链接 http://res.cloudinary.com/dm1hql92i/raw/upload/c_fill,h_200,w_200/%7B%7D 我想用ruby检查该链接中是否存在图像。通过检查HTTP头中存在的内容类型,您就会知道这一点 请参考下面的代码片段 require 'net/http' require 'uri' def image_exists?(url) url = URI.parse(url) http = Net::HTTP.start
http://res.cloudinary.com/dm1hql92i/raw/upload/c_fill,h_200,w_200/%7B%7D
我想用ruby检查该链接中是否存在图像。通过检查
HTTP头中存在的内容类型
,您就会知道这一点
请参考下面的代码片段
require 'net/http'
require 'uri'
def image_exists?(url)
url = URI.parse(url)
http = Net::HTTP.start(url.host, url.port)
http.head(url.request_uri)['Content-Type'].start_with? 'image'
end
url = "http://res.cloudinary.com/dm1hql92i/raw/upload/c_fill,h_200,w_200/%7B%7D"
image_exists?(url)
=> true
url = "http://guides.rubyonrails.org/getting_started.html"
image_exists?(url)
=> false
出于某些原因,甘尼什的回答对我不起作用,以下是我的方法:
def image_exists?(url)
response = {}
uri = URI(url)
Net::HTTP.start(uri.host, uri.port, :use_ssl => uri.scheme == 'https') do |http|
request = Net::HTTP::Get.new uri
response = http.request request # Net::HTTPResponse object
end
return response.content_type.starts_with?("image")
end
请阅读并编辑您的问题以包含更多信息。到目前为止,您尝试了什么,犯了什么错误,在哪里遇到了问题?