fix 'NoneType' and new ContentType supported. (#4818)

api/core/rag/extractor/extract_processor.py

 from extensions.ext_storage import storage
 from models.model import UploadFile
 
-SUPPORT_URL_CONTENT_TYPES = ['application/pdf', 'text/plain']
+SUPPORT_URL_CONTENT_TYPES = ['application/pdf', 'text/plain', 'application/json']
 USER_AGENT = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36"
 
 

api/core/tools/utils/web_reader_tool.py

     if content_type:
         main_content_type = response.headers.get('Content-Type').split(';')[0].strip()
     else:
-        content_disposition = response.headers.get('Content-Disposition')
+        content_disposition = response.headers.get('Content-Disposition', '')
         filename_match = re.search(r'filename="([^"]+)"', content_disposition)
         if filename_match:
             filename = unquote(filename_match.group(1))