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If I add a string to the response, which contains non-printable characters, the output will not be parsed by the most of the XML parsers (I tried with XML-RPC for PHP).
Here is my quick and dirty fix:
--- a/Lib/xmlrpclib.py
+++ b/Lib/xmlrpclib.py
@@ -165,9 +165,18 @@ def _decode(data, encoding, is8bit=re.compile("[\x80-\xff]").search):
 return data
 
 def escape(s, replace=string.replace):
- s = replace(s, "&", "&")
- s = replace(s, "<", "&lt;")
- return replace(s, ">", "&gt;",)
+ res = ''
+ for char in s:
+ char_code = ord(char)
+ if (char_code < 32 and char_code not in (9, 10, 13)) or char_code > 126:
+ res += '\\x%02x' % ord(char)
+ else:
+ res += char
+
+ res = replace(res, "&", "&amp;")
+ res = replace(res, "<", "&lt;")
+ res = replace(res, ">", "&gt;")
+ return res
 
 if unicode:
 def _stringify(string):