Support chunked encoding. (#1226)

* Support chunked encoding.

The koboldcpp API does not support HTTP chunked encoding. Some HTTP
libraries, notable Go's net/http can automatically choose to use chunked
encoding. This adds support for chunked encoding within the do_POST()
handler.

* refactor slightly to add additional safety checks and follow original format

---------

Co-authored-by: Concedo <39025047+LostRuins@users.noreply.github.com>

koboldcpp.py

@@ -1992,6 +1992,39 @@ Enter Prompt:<br>
                 }}).encode())
                 return
             body = self.rfile.read(content_length)
+        elif self.headers.get('transfer-encoding', '').lower()=="chunked":
+            content_length = 0
+            chunklimit = 0  # do not process more than 512 chunks, prevents bad actors
+            body = b''
+            try:
+                while True:
+                    chunklimit += 1
+                    line = self.rfile.readline().strip()
+                    if line:
+                        chunk_length = max(0,int(line, 16))
+                        content_length += chunk_length
+                    if not line or chunklimit > 512 or content_length > (1024*1024*32): #32mb payload limit
+                        self.send_response(500)
+                        self.end_headers(content_type='application/json')
+                        self.wfile.write(json.dumps({"detail": {
+                        "msg": "Payload is too big. Max payload size is 32MB.",
+                        "type": "bad_input",
+                        }}).encode())
+                        return
+                    if chunk_length != 0:
+                        chunk = self.rfile.read(chunk_length)
+                        body += chunk
+                    self.rfile.readline()
+                    if chunk_length == 0:
+                        break
+            except Exception as e:
+                self.send_response(500)
+                self.end_headers(content_type='application/json')
+                self.wfile.write(json.dumps({"detail": {
+                "msg": "Failed to parse chunked request.",
+                "type": "bad_input",
+                }}).encode())
+                return
 
         self.path = self.path.rstrip('/')
         response_body = None