Truncated Output Using Python Bottle 0.12.8 As A Cgi Application Under Windows On An Apache Server

Question

This is the application: #!/home2/friendv0/Python-2.7.9/bin/python from bottle import Bottle app = Bottle() @app.get('/') def hello(): return '''

Solution 1:

Well, I have figured out the problem. The string literal length is 201 characters long (which is the content-length in the header). Each line is terminated by a single LF (linefeed) character (even though on Windows the actual text is terminated with CRLF). Yet, when the text is being sent out to the browser, each line ending is now a CR-LF pair, making the actual output longer than 201 characters, but because of the content-length being set in the header, there is truncation. I went back to my other, working WSGi-CGI application and now remember that because there were instances where I was sending out images, that I had set the stdout stream to binary mode (not necessary on Unix/Linux). This clearly had the side effect of preventing extra carriage return characters from being inserted in text streams if I had templates without them to begin with. So, now I have the following code:

import osifos.name == 'nt':
    import msvcrt
    msvcrt.setmode(0, os.O_BINARY ) # 0 = sysin
    msvcrt.setmode(1, os.O_BINARY ) # 0 = stdout

app.run(server='cgi')

Solution 2:

Yes, I had the same problem in my Flask application: Python 2.7.13 CGIHandler (mod_cgi), Apache 2.2 on Windows platform. The solution is confirmed! This is a test script:

#!C:/Python27/python.exe
# -*- coding: utf-8 -*-

import os

if os.name == 'nt':
    import msvcrt
    msvcrt.setmode( sys.stdin.fileno(), os.O_BINARY )
    msvcrt.setmode( sys.stdout.fileno(), os.O_BINARY )
    msvcrt.setmode( sys.stderr.fileno(), os.O_BINARY )

from wsgiref.handlers import CGIHandler

def application(environ, start_response):
    start_response('200 OK', [('Content-Type', 'text/plain')])
    return ['Hello World!\nXMX\nYMY\n']

if __name__ == '__main__':
    CGIHandler().run( application )

Without the msvcrt.setmode the output will be truncated. The same application with WSGI (mod_wsgi) works correctly. No CGI problems on POSIX systems. Another solution is to put Python in 'unbuffered mode' adding -u parameter to the interpreter directive:

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#!C:/Python27/python.exe -u# -*- coding: utf-8 -*-from wsgiref.handlers import CGIHandler

defapplication(environ, start_response):
    start_response('200 OK', [('Content-Type', 'text/plain')])
    return ['Hello World!\nXMX\nYMY\n']

if __name__ == '__main__':
    CGIHandler().run( application )

Python documentation reference says: -u Force stdin, stdout and stderr to be totally unbuffered. On systems where it matters, also put stdin, stdout and stderr in binary mode.

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Truncated Output Using Python Bottle 0.12.8 As A Cgi Application Under Windows On An Apache Server

Solution 1:

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