[mod_python] UnicodeDecodeError with util.FieldStorage(req).Field.value

Hi,

I'm struggling with UnicodeDecodeError when trying to append 
util.FieldStorage(req).Field.value with umlaut into a variable of type 
unicode.

<SNIP>
<%
# file: test.psp

from mod_python import Session, util
req.assbackwards

req.content_type = 'text/html; charset=UTF-8'
%>
<!--SOME HTML HEAD STUFF HERE-->

<form action="/test.psp" method="post" enctype="text/plain" 
accept-charset="UTF-8">
<!-- form calls this very same file -->
<input name="name" type="text" size="30" maxlength="50" />
<input type="submit" value="Submit" />
</form>

<%
req.write('<p>Write values to HTML</p>') # Works fine!
store = util.FieldStorage(req)
for param in store.list:
    req.write(param.value)
%>
<b><%=param.name%></b>:<%=param.value%>:<%=type(param.value)%><br />
<%

req.write('<p>Append all values to the variable msg</p>')
msg = u''
for param in store.list:
    msg += param.name + ': ' + param.value + '\r\n' # UnicodeDecodeError!
%>
<!--SOME HTML FOOT STUFF HERE-->

</SNIP>


So, when calling this page the HTML output for first section is rendered with 
umlaut (ä, ü, ...). Value is <type 'str'> ... well, why not, as long as it is 
UTF-8...

But as soon as the script tries to append param.value to the unicode 
variable "msg" I'm getting this error:

UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 26: 
ordinal not in range(128)


I do not understand why I'm getting this error. How does 'ascii' come into 
this? How do I know which encoding is really applied (in param.value and in 
msg)?

I'm blind, hum?

Anastasios
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