Tornado – Blocking & Non-Blocking HTTP Client

Tornado provides tornado.httpclient that works as httpclient and can send blocking and non-blocking (async) http requests.

tornado.httpclient.HTTPClient

1. HTTPClient: This tornado client is typically used for testing web servers or simply making a HTTP request and receiving the response. An example implementation below

print "Blocking HTTPClient"
from tornado import ioloop
from tornado import httpclient
http_client = httpclient.HTTPClient()
try:
http_client.fetch("http://google.co.in/")
print "HTTPClient Response"
except httpclient.HTTPError, e:
print "Error:", e

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tornadohttpclient.py
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tornado.httpclient.AsyncHTTPClient

2. AsyncHTTPClient: httpclient.AsyncHTTPClient()  creates an instance of the class and that can be reused one per IO loop. Here’s an example implementation below

print "\nNon-Blocking AsyncHTTPClient"
import tornado.ioloop
def async_call(response):
if response.error:
response.rethrow()
print "AsyncHTTPClient Response"
ioloop.IOLoop.instance().stop()
http_client = httpclient.AsyncHTTPClient()
http_client.fetch("http://www.google.co.in/", async_call)
ioloop.IOLoop.instance().start()

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