我想在Raspberry上运行的浏览器中从angular应用程序调用Webiopi REST API。由于Webiopi HTTP服务器不允许CORS请求,我使用apache创建了一个代理,用于发送
Header add "Access-Control-Allow-Origin" "*"
标题。
这工作正常,但是调用RESTAPI会引发许多错误,主要是因为浏览器向服务器发送选项请求,以防CORS请求检查是否允许。但是webiopi http处理程序根本不处理选项动词。
def do_OPTIONS(self):
self.send_response(200,"ok")
self.send_header("Access-Control-Allow-Origin", "*")
self.send_header("Access-Control-Allow-Methods", "POST,GET,OPTIONS")
self.send_header("Access-Control-Allow-Headers", "Authorization")
self.send_header("Access-Control-Allow-Headers", "Content-Type")
self.end_headers()
现在它不会抛出任何错误,但不会对GET请求给出正确的响应。它只是在选项之后停止。请求和响应如下所示:
请求标头:
OPTIONS /GPIO/1/value HTTP/1.1
Host: localhost:8000
Connection: keep-alive
Access-Control-Request-Method: GET
Origin: http://192.168.1.108:51443
User-Agent: Mozilla/5.0 (X11; Linux armv7l) AppleWebKit/537.36 (KHTML, like Gecko) Raspbian Chromium/65.0.3325.181 Chrome/65.0.3325.181 Safari/537.36
Access-Control-Request-Headers: authorization
Accept: */*
Accept-Encoding: gzip, deflate, br
Accept-Language: hu-HU,hu;q=0.9,en-US;q=0.8,en;q=0.7
响应标题:
HTTP/1.1 200 OK
Date: Fri, 23 Nov 2018 22:06:28 GMT
Server: WebIOPi/0.7.1/Python3.5
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: POST,GET,OPTIONS
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET,POST,OPTIONS
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Transfer-Encoding: chunked
常规(从chrome网络选项卡):
Request URL: http://localhost:8000/GPIO/1/value
Request Method: OPTIONS
Status Code: 200 OK
Remote Address: [::1]:8000
Referrer Policy: no-referrer-when-downgrade
我的GET请求在哪里?为什么我只看到那些我根本就没有开始的选项?
来自angular的请求:
this.http.get<number>(this.route+'GPIO/'+gpio+'/value').subscribe(result => {
resolve(result);
})
