Derek Basch wrote:
> Can anyone tell me why this CGI code outputs a blank page?
> --------------------------------
> self.output = []
> self.setContentType("text/plain")
> ascii_temp.seek(0)
> self.output.extend(ascii_temp.read())
> print ''.join(self.output)
>
> def setContentType(self, type="text/xml"):
> self.output.extend(["Content-type: ", type, "\n\r"])
> ---------------------------------
>
> but this code works?:
> ---------------------------------
> self.output = []
> self.setContentType("text/plain")
> print ''.join(self.output)
> ascii_temp.seek(0)
> print ascii_temp.read()
>
> def setContentType(self, type="text/xml"):
> self.output.extend(["Content-type: ", type, "\n\r"])
> ---------------------------------
> [snip]
First thing: HTTP header lines must be terminated by "\r\n" not "\n\r".
The headers are terminated by another "\r\n". I'm not sure (but I would bet
an Euro or two that it does), but perhaps the webserver sanitizes the
output of CGI script and converts plain "\n" into "\r\n" - if not then you
shouldn't use print to output the headers, because it only outputs
non-HTTPish "\n".
The output of your first script is
---------------------------------------
Content-type: text/plain\r\n
Allele...
---------------------------------------
whereas the second script outputs
---------------------------------------
Content-type: text/plain\r\n
\n
Allele...
---------------------------------------
The (required) "\n" - that should also be an "\r\n" - seperating the headers
from the content is added by the first print.
--
Benjamin Niemann
Email: pink at odahoda dot de
WWW: http://www.odahoda.de/
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