added cors to response

Author: mirkin

src/response.py

@@ -1,11 +1,17 @@
 import os
 
 class Response:
-    def __init__(self, writer):
+    def __init__(self, writer, enable_cors=False):
         self.writer = writer
+        self.enable_cors = enable_cors
 
     async def send_headers(self, status_code=200, content_type="text/html", content_length=None):
         headers = f'HTTP/1.0 {status_code}\r\nContent-type: {content_type}\r\n'
+        if self.enable_cors:
+            # allow CORS
+            headers += 'Access-Control-Allow-Origin: *\r\n'
+            headers += 'Access-Control-Allow-Methods: GET, POST, PUT, DELETE, OPTIONS\r\n'
+            headers += 'Access-Control-Allow-Headers: Content-Type, Access-Control-Allow-Headers, Authorization, X-Requested-With\r\n'
         if content_length is not None:
             headers += f'Content-Length: {content_length}\r\n'
         headers += '\r\n'
@@ -28,9 +34,9 @@ async def send_file(self, file_path, status_code=200, content_type="text/html"):
         try:
             file_size = os.stat(file_path)[6]
             await self.send_headers(status_code, content_type, content_length=file_size)
-
             #chunk_size = 1024  # Adjust the chunk size as needed
             #chunk_size = 512  # Adjust the chunk size as needed
+            #chunk_size = 256
             chunk_size = 256
             with open(file_path, "rb") as f:
                 while True:
@@ -39,9 +45,7 @@ async def send_file(self, file_path, status_code=200, content_type="text/html"):
                         break
                     self.writer.write(chunk)
                     await self.writer.drain()
-
             await self.writer.wait_closed()
-
         except Exception as e:
             print("Error sending file:", e)
             await self.send('', status_code=404)