Processing HTTP GET input parameter on server side in python

Question

I wrote a simple HTTP client and server in Python for experimenting. The first code snippet below shows how I send an HTTP GET request with a parameter named imsi. In the second code snippet I show my do_Get function implementation in the server side. My question is how I can extract the imsi parameter in the server code and send a response back to the client in order to signal the client that imsi is valid.
Thanks.

P.S.: I verified that the client sends the request successfully.

CLIENT code snippet

    params = urllib.urlencode({'imsi': str(imsi)})
    conn = httplib.HTTPConnection(host + ':' + str(port))
    #conn.set_debuglevel(1)
    conn.request("GET", "/index.htm", 'imsi=' + str(imsi))
    r = conn.getresponse()

SERVER code snippet

import sys, string, cStringIO, cgi, time, datetime
from os import curdir, sep
from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer

class MyHandler(BaseHTTPRequestHandler):

# I want to extract the imsi parameter here and send a success response to 
# back to the client.
def do_GET(self):
    try:
        if self.path.endswith(".html"):
            #self.path has /index.htm
            f = open(curdir + sep + self.path)
            self.send_response(200)
            self.send_header('Content-type','text/html')
            self.end_headers()
            self.wfile.write("<h1>Device Static Content</h1>")
            self.wfile.write(f.read())
            f.close()
            return
        if self.path.endswith(".esp"):   #our dynamic content
            self.send_response(200)
            self.send_header('Content-type','text/html')
            self.end_headers()
            self.wfile.write("<h1>Dynamic Dynamic Content</h1>")
            self.wfile.write("Today is the " + str(time.localtime()[7]))
            self.wfile.write(" day in the year " + str(time.localtime()[0]))
            return

        # The root
        self.send_response(200)
        self.send_header('Content-type','text/html')
        self.end_headers()

        lst = list(sys.argv[1])
        n = lst[len(lst) - 1]
        now = datetime.datetime.now()

        output = cStringIO.StringIO()
        output.write("<html><head>")
        output.write("<style type=\"text/css\">")
        output.write("h1 {color:blue;}")
        output.write("h2 {color:red;}")
        output.write("</style>")
        output.write("<h1>Device #" + n + " Root Content</h1>")
        output.write("<h2>Device Addr: " + sys.argv[1] + ":" + sys.argv[2] + "</h1>")
        output.write("<h2>Device Time: " + now.strftime("%Y-%m-%d %H:%M:%S") + "</h2>")
        output.write("</body>")
        output.write("</html>")

        self.wfile.write(output.getvalue())

        return

    except IOError:
        self.send_error(404,'File Not Found: %s' % self.path)

don't you get the args sent with the GET request?

aayoubi
– aayoubi

2012-01-19 16:05:45 +00:00
Commented Jan 19, 2012 at 16:05 — aayoubi
– aayoubi, Commented Jan 19, 2012 at 16:05
Related: stackoverflow.com/questions/2490162/…

Anton Tarasenko
– Anton Tarasenko

2017-11-14 18:51:32 +00:00
Commented Nov 14, 2017 at 18:51 — Anton Tarasenko
– Anton Tarasenko, Commented Nov 14, 2017 at 18:51

ib.lundgren · Accepted Answer · 2012-01-19 18:30:10Z

62

You can parse the query of a GET request using urlparse, then split the query string.

from urlparse import urlparse
query = urlparse(self.path).query
query_components = dict(qc.split("=") for qc in query.split("&"))
imsi = query_components["imsi"]
# query_components = { "imsi" : "Hello" }

# Or use the parse_qs method
from urlparse import urlparse, parse_qs
query_components = parse_qs(urlparse(self.path).query)
imsi = query_components["imsi"] 
# query_components = { "imsi" : ["Hello"] }

You can confirm this by using

 curl http://your.host/?imsi=Hello

edited Jan 19, 2012 at 18:30

answered Jan 19, 2012 at 16:14

ib.lundgren

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2 Comments

Bill Gribble Over a year ago

& is a shell special character ... Needs to be escaped so your curl command passes both params

Gabriel Devillers Over a year ago

With Python 3, use from urllib.parse import urlparse source: stackoverflow.com/a/5239594/4669135

yurez · Accepted Answer · 2015-09-17 08:47:11Z

22

BaseHTTPServer is a pretty low-level server. Generally you want to use a real web framework that does this kind of grunt work for you, but since you asked...

First import a url parsing library. In Python 2,x it's urlparse. (In Python3, you'd use urllib.parse)

import urlparse

Then, in your do_get method, parse the query string.

imsi = urlparse.parse_qs(urlparse.urlparse(self.path).query).get('imsi', None)
print imsi  # Prints None or the string value of imsi

Also, you could be using urllib in your client code and it would probably be a lot easier.

edited Sep 17, 2015 at 8:47

yurez

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answered Jan 19, 2012 at 17:23

Ken Kinder

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Comments

BatRamboZPM · Accepted Answer · 2022-12-31 18:38:02Z

2

If you dont want to import additional libraries in most cases you can use:

i = self.path.index ( "?" ) + 1
params = dict ( [ tuple ( p.split("=") ) for p in self.path[i:].split ( "&" ) ] )

answered Dec 31, 2022 at 18:38

BatRamboZPM

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Comments

newtover · Accepted Answer · 2012-01-19 17:57:54Z

0

cgi module contains FieldStorage class which is supposed to be used in CGI context, but seems to be easily used in your context as well.

answered Jan 19, 2012 at 17:57

newtover

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