I have been trying to make a basic multi-part form in Python 3.6. The do_GET method is working perfectly, but the do_POST method keeps failing.
When I submit the form in Chrome, it says that localhost didn’t send any data. ERR_EMPTY_RESPONSE, but when I check the Network tab in the Developer Console, I can see the form values.
The code seems to be working perfectly with Python 2.7. I am not sure with where I went wrong in the code.
Here's the code I wrote:
from http.server import BaseHTTPRequestHandler, HTTPServer
import cgi
class WebServerHandle(BaseHTTPRequestHandler):
def do_GET(self):
try:
if self.path.endswith("/new"):
self.send_response(200)
self.send_header('Content-type', 'text/html')
self.end_headers()
output = ""
output += "<html><head><style>body {font-family: Helvetica, Arial; color: #333}</style></head>"
output += "<body><h2>Add new Restaurant</h2>"
output += "<form method='POST' enctype='multipart/form-data' action='/new'>"
output += "<input name='newRestaurantName' type='text' placeholder='New Restaurant Name'> "
output += "<input type='submit' value='Add Restaurant'>"
output += "</form></html></body>"
self.wfile.write(bytes(output, "utf-8"))
return
if self.path.endswith("/restaurant"):
self.send_response(200)
self.send_header('Content-type', 'text/html')
self.end_headers()
output = ""
output += "<html><head><style>body {font-family: Helvetica, Arial; color: #333}</style></head>"
output += "<body><h3>Restaurant name added successfully!</h3>"
output += "</html></body>"
self.wfile.write(bytes(output, "utf-8"))
return
except IOError:
self.send_error(404, 'File Not Found: %s' % self.path)
def do_POST(self):
try:
if self.path.endswith("/new"):
ctype, pdict = cgi.parse_header(self.headers.getheader('content-type'))
if ctype == 'multipart/form-data':
fields = cgi.parse_multipart(self.rfile, pdict)
restaurant_name = fields.get('newRestaurantName')
print("Restaurant name is ", restaurant_name)
self.send_response(301)
self.send_header('Content-type', 'text/html')
self.send_header('Location', '/restaurant')
self.end_headers()
except:
print("Something went wrong, inside exception..")
def main():
try:
server = HTTPServer(('', 8080), WebServerHandle)
print("Starting web server on the port 8080..")
server.serve_forever()
except KeyboardInterrupt:
print('^C entered. Shutting down the server..')
server.socket.close()
if __name__ == '__main__':
main()
Made a change to decode to the field values from the form.
Changed the self.headers.getheader('content-type') method to
self.headers.('content-type').
Then added the following line after that, to decode the pdict value:
pdict['boundary'] = bytes(pdict['boundary'], "utf-8"),
and then to print the field values by converting from bytes to string, I changed the print line to
print("Restaurant name is ", restaurant_name[0].decode("utf-8")).
So the final code looks like:
def do_POST(self):
try:
if self.path.endswith("/new"):
ctype, pdict = cgi.parse_header(self.headers['content-type'])
pdict['boundary'] = bytes(pdict['boundary'], "utf-8")
if ctype == 'multipart/form-data':
fields = cgi.parse_multipart(self.rfile, pdict)
print("Fields value is", fields)
restaurant_name = fields.get('newRestaurantName')
print("Restaurant name is ", restaurant_name[0].decode("utf-8"))
self.send_response(301)
self.send_header('Content-type', 'text/html')
self.send_header('Location', '/restaurant')
self.end_headers()
except:
print("Inside the exception block")