urllib2 and json

Question

can anyone point out a tutorial that shows me how to do a POST request using urllib2 with the data being in JSON format

User · Answer

Whatever urllib is using to figure out Content-Length seems to get confused by json, so you have to calculate that yourself.

import json
import urllib2
data = json.dumps([1, 2, 3])
clen = len(data)
req = urllib2.Request(url, data, {'Content-Type': 'application/json', 'Content-Length': clen})
f = urllib2.urlopen(req)
response = f.read()
f.close()

Took me for ever to figure this out, so I hope it helps someone else.

User · Answer

Messa s answer only works if the server isn t bothering to check the content-type header  You ll need to specify a content-type header if you want it to really work  Here s Messa s answer modified to include a content-type header   import json import urllib2 data   json dumps  1  2  3   req   urllib2 Request url  data    Content-Type    application json    f   urllib2 urlopen req  response   f read   f close

User · Answer

Example - sending some data encoded as JSON as a POST data   import json import urllib2 data   json dumps  1  2  3   f   urllib2 urlopen url  data  response   f read   f close

User · Answer

You certainly want to hack the header to have a proper Ajax Request    headers     X REQUESTED WITH    XMLHttpRequest               ACCEPT    application json  text javascript       q 0 01    request   urllib2 Request path  data  headers  response   urllib2 urlopen request  read     And to json loads the POST on the server-side    Edit   By the way  you have to urllib urlencode mydata dict  before sending them  If you don t  the POST won t be what the server expect

User · Answer

To read json response use json loads    Here is the sample   import json import urllib import urllib2  post params          foo    bar    params   urllib urlencode post params  response   urllib2 urlopen url  params  json response   json loads response read

User · Answer

This is what worked for me   import json import requests url    http   xxx com  payload     param    1    data    2    field    4   headers     content-type    application json   r   requests post url  data   json dumps payload   headers   headers

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