javascript - 同源政策有问题

Question

我的 java 脚本发布请求出现此错误“请求的资源上不存在 'Access-Control-Allow-Origin' header 。因此不允许访问 Origin 'null'。”

JavaScript(客户端)后置代码

function doapost(exam){
    $.ajax({
        type: "POST",
        url: "http://localhost:8080/pexam",
        data: exam,
        dataType: "json",
        success:function(e){alert("worked")}, // The function to call on success
         error: function(e){alert("never worked")},      
    })
}

Python(网络服务)邮政编码

class postexamhandeler(webapp2.RequestHandler):
    def post(self):
        owner = self.request.get('owner')
        name = self.request.get('ename')
        date = self.request.get('edate')
        leangth = self.request.get('eleangth')
        pencil = self.request.get('epencil')
        pen = self.request.get('epen')
        calculator = self.request.get('ecalculator')
        ruller = self.request.get('eruller')
        type = self.request.get('etype')
        self.response.headers["Content-Type"] = "application/json"
        self.response.headers['charset'] = "utf-8"
        if len(name) > 0 and len(type) > 0:
            self.response.out.write('{ "response": "OK"}')
        else:
            self.response.out.write('{ "response": "ERROR"}')
        exm = makeexam(id= owner)
        exm.ename = name
        exm.edate = date
        exm.eleangth = leangth
        exm.epencil = pencil
        exm.epen = pen
        exm.ecalculator = calculator
        exm.eruller = ruller
        exm.etype = type
        exm.put()    
        self.response.out.write('{ "response": "OK"}')

Answer 1

您需要允许来自服务器的跨源请求。在 PHP 中，这可以解决问题

header('Access-Control-Allow-Origin: *');

通过查看您的 python 代码，我想这应该有所帮助(.. 我想)

class postexamhandeler(webapp2.RequestHandler):
    def post(self):
        owner = self.request.get('owner')
        name = self.request.get('ename')
        date = self.request.get('edate')
        leangth = self.request.get('eleangth')
        pencil = self.request.get('epencil')
        pen = self.request.get('epen')
        calculator = self.request.get('ecalculator')
        ruller = self.request.get('eruller')
        type = self.request.get('etype')
        self.response.headers["Content-Type"] = "application/json"
        self.response.headers["Access-Control-Allow-Origin"] = "*"
        self.response.headers['charset'] = "utf-8"
        if len(name) > 0 and len(type) > 0:
            self.response.out.write('{ "response": "OK"}')
        else:
            self.response.out.write('{ "response": "ERROR"}')
        exm = makeexam(id= owner)
        exm.ename = name
        exm.edate = date
        exm.eleangth = leangth
        exm.epencil = pencil
        exm.epen = pen
        exm.ecalculator = calculator
        exm.eruller = ruller
        exm.etype = type
        exm.put()    
        self.response.out.write('{ "response": "OK"}')

这应该添加 cors 响应 header

self.response.headers["Access-Control-Allow-Origin"] = "*"