启用Webiopi CORS请求

Question

我想在Raspberry上运行的浏览器中从我的angular应用程序调用Webiopi REST API。由于WebiopiHTTP服务器不允许CORS请求，我用apache创建了一个代理，用于发送Header add "Access-Control-Allow-Origin" "*"头。

这很好，但是对REST API的调用抛出了许多错误，主要是因为浏览器在CORS请求的情况下向服务器发送OPTIONS请求，以检查是否允许。但是webiopihttp处理程序根本不处理OPTIONS谓词。

所以我开始在没有python经验的情况下自己把它写进代码中。在文件python/webiopiprotocols/http.py中，我在末尾添加了：

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()

现在它没有抛出任何错误，但没有给我对GET请求的正确响应。它只是在OPTIONS之后停止。请求和响应如下：

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

响应标头：

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(来自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？为什么我只看到我根本没有启动的选项？

来自angular的请求：

this.http.get<number>(this.route+'GPIO/'+gpio+'/value').subscribe(result => {
resolve(result);
})

Answer 1

我必须启用http服务器的所有标头：

def do_OPTIONS(self):
self.send_response(200,"ok")
self.send_header("Access-Control-Allow-Origin", "*")
self.send_header("Access-Control-Allow-Methods", "*")
self.send_header("Access-Control-Allow-Headers", "*")
self.end_headers()