Jython example script to send POST request which size is over 65536 byte

http_request.py

# -*- coding: utf-8 -*-

# HTTP POST request example to resolve post size bug in Jython.
#
# Jython from 2.7.1 can't use synchronous socket to send data more than
# 65536 bytes at once (sends first socket and blocks infinitely), because
# jython didn't catch if socket.sendall() sends successfully. This bug was
# reported at 2017 but until now(2021.2.) there is no official fix, so
# instead of waiting I made a simple script using Java's native
# `java.net.URLConnection` class.
#
# Tested on Jython 2.7.1 + Oracle JDK 1.8
#
# References:
#   - https://bugs.jython.org/issue2618
#   - https://bugs.jython.org/issue2508


from java.net import URL
from java.io import DataOutputStream


# Java native HTTPClient; jython can't send longer than 65536bytes to send
def http_request_reqonly(url, data):
    con = URL(url).openConnection()
    con.setRequestMethod('POST')
    con.setRequestProperty('Content-Type', 'application/x-www-form-urlencoded')
    con.setRequestProperty('Accept', 'text/plain')
    con.setConnectTimeout(5*1000)
    con.setReadTimeout(60*1000)
    con.setInstanceFollowRedirects(False)
    con.setDoOutput(True)

    wr = DataOutputStream(con.getOutputStream())
    wr.writeBytes(bytes(urllib.urlencode(data)))
    wr.flush()
    wr.close()

    status_code = con.getResponseCode()
    con.disconnect()
    return status_code


# Usage example
http_request_reqonly('http://localhost:5000/push', {
    'foo': 'bar'
})