删除 python HTTP 服务器中的缓存

Question

我在网上找到了这个服务器并对其进行了一些编辑。 这是代码：

from http.server import BaseHTTPRequestHandler, HTTPServer
from xml.dom import minidom
import os


class MyHandler(BaseHTTPRequestHandler):
    def do_POST(self):
        self.data_string = self.rfile.read(int(self.headers['Content-Length']))
        self.send_response(200)
        self.end_headers()
        valore = str(self.data_string)[2:-1]
        response = ["",""]
        response[0],response[1] = processData(valore)
        if response[0] == 1:
            sep = ""
            message = ""
            for res in response[1]:
                message += res
            response = sep.join(message)
            self.wfile.write(bytes(message, "utf-8"))

    def do_GET(self):
        # Send response status code
        self.send_response(200)
        # Send headers
        if self.path.endswith("html"):
            self.send_header('Content-type', 'text/html')
            self.end_headers()
        elif self.path.endswith("css"):
            self.send_header('Content-type', 'text/css')
            self.end_headers()
        elif self.path.endswith("js"):
            self.send_header('Content-type', 'application/javascript')
            self.end_headers()
        elif self.path.endswith(".ico"):
            print(self.rawpath)
        if not self.path.endswith("jpeg") and not self.path.endswith("jpg") and not self.path.endswith("png") and not self.path.endswith("gif"):
            with open(self.path[1:], 'r') as myfile:
                data = myfile.read()
            # Write content as utf-8 data
            self.wfile.write(bytes(data, "utf8"))
        if self.path.endswith("jpeg"):
            f = open(self.path[1:], 'rb')
            self.send_response(200)
            self.send_header('Content-type', 'image/jpeg')
            self.end_headers()
            self.wfile.write(f.read())
            f.close()
        elif self.path.endswith("png"):
            f = open(self.path[1:], 'rb')
            self.send_response(200)
            self.send_header('Content-type', 'image/png')
            self.end_headers()
            self.wfile.write(f.read())
            f.close()
        elif self.path.endswith("gif"):
            f = open(self.path[1:], 'rb')
            self.send_response(200)
            self.send_header('Content-type', 'image/gif')
            self.end_headers()
            self.wfile.write(f.read())
            f.close()
        elif self.path.endswith("jpg"):
            f = open(self.path[1:], 'rb')
            self.send_response(200)
            self.send_header('Content-type', 'image/jpeg')
            self.end_headers()
            self.wfile.write(f.read())
            f.close()
        return

def run():
    print('starting server...')

    # Server settings
    # Choose port 8080, for port 80, which is normally used for a http server, you need root access
    server_address = ('192.168.2.245', 8081)
    httpd = HTTPServer(server_address, MyHandler)
    print('running server...')
    httpd.serve_forever()


def processData(data):
    XMLlist = []
    data = data.split(":")
    if data[0] == "XMLlist":
        path = os.path.realpath(__file__)
        path = os.path.dirname(path)
        for filename in os.listdir(path):
            if filename.endswith('.xml'):
                XMLlist.append(filename[:-3])
        return 1,XMLlist
                #fullname = os.path.join(path, filename)
    else:
        file = open('default.xml', 'r')
        tree = minidom.parse(file)
        tree.getElementsByTagName(data[0])[0].childNodes[0].replaceWholeText(data[1])
        file = open('default.xml', 'w')
        tree.writexml(file)
        file.close()
        return 0, 1


run()

服务器工作正常，我需要删除缓存。当我尝试从 html 页面刷新同名图像时，服务器返回给我缓存的图像......你有什么建议吗？

谢谢你，抱歉我的英语...

Answer 1

http.server

不发送“无缓存”标头，因此我们需要发送“无缓存”标头

# NoCacheHTTPServer.py

import http.server

PORT = 8000

class NoCacheHTTPRequestHandler(
    http.server.SimpleHTTPRequestHandler
):
    def send_response_only(self, code, message=None):
        super().send_response_only(code, message)
        self.send_header('Cache-Control', 'no-store, must-revalidate')
        self.send_header('Expires', '0')

if __name__ == '__main__':
    http.server.test(
        HandlerClass=NoCacheHTTPRequestHandler,
        port=PORT
    )

在 CLI 中运行

python NoCacheHTTPServer.py

Answer 2

尝试按 Ctrl+F5 或 Shift+F5

刷新浏览器

Answer 3

如果此服务器的目的仅用于本地测试（我认为这是最常见的用例），您还可以禁用 Chrome 浏览器的缓存。

禁用缓存的详细说明在这里。