UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb6 in position 0: invalid start byte

[MRAB]

On 04/07/2013 13:47, Νίκος wrote:
> Στις 4/7/2013 3:07 μμ, ο/η MRAB έγραψε:
>> On 04/07/2013 12:36, Νίκος wrote:
>>> Στις 4/7/2013 2:06 μμ, ο/η MRAB έγραψε:
>>>> On 04/07/2013 11:38, Νίκος wrote:
>>>>> Στις 4/7/2013 12:50 μμ, ο/η Ulrich Eckhardt έγραψε:
>>>>>> Am 04.07.2013 10:37, schrieb Νίκος:
>>>>>>> I just started to have this error without changing nothing
>>>>>>
>>>>>> Well, undo the nothing that you didn't change. ;)
>>>>>>
>>>>>>> UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb6 in
>>>>>>> position 0:
>>>>>>> invalid start byte
>>>>>>> [Thu Jul 04 11:35:14 2013] [error] [client 108.162.229.97] Premature
>>>>>>> end
>>>>>>> of script headers: metrites.py
>>>>>>>
>>>>>>> Why cant it decode the starting byte? what starting byte is that?
>>>>>>
>>>>>> It's the 0xb6 but it's expecting the starting byte of a UTF-8
>>>>>> sequence.
>>>>>> Please do some research on UTF-8, that should clear it up. You could
>>>>>> also search for common causes of that error.
>>>>>
>>>>> So you are also suggesting that what gesthostbyaddr() returns is not
>>>>> utf-8 encoded too?
>>>>>
>>>>> What character is 0xb6 anyways?
>>>>>
>>>> Well, it's from a bytestring, so you'll have to specify what encoding
>>>> you're using! (It clearly isn't UTF-8.)
>>>>
>>>> If it's ISO-8859-7 (what you've previously referred to as "greek-iso"),
>>>> then:
>>>>
>>>>  >>> import unicodedata
>>>>  >>> unicodedata.name(b"\xb6".decode("ISO-8859-7"))
>>>> 'GREEK CAPITAL LETTER ALPHA WITH TONOS'
>>>>
>>>> You'll need to find out where that bytestring is coming from.
>>>
>>> Right.
>>> But nowhere in my script(metrites.py) i use an 'Ά' so i really have no
>>> clue where this is coming from.
>>>
>>> And you are right if it was a byte came from an utf-8 encoding scheme
>>> then it would be automatically decoded.
>>>
>>> The only thing i can say for use is that this problem a[[ear only when i
>>> cloudflare my domain "superhost.gr"
>>>
>>> If i un-cloudlflare it it cease to display errors.
>>>
>>> Can you tell me hpw to write the following properly:
>>>
>>> host = socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )[0] or
>>> 'UnResolved'
>>>
>>> so even if the function fails "unresolved" to be returned back?
>>> Somehow i need to capture the error.
>>>
>>> Or it dosnt have to do it the or operand will be returned?
>>>
>> If gethostbyaddr fails, it raises socket.gaierror, (which, from Python
>> 3.3 onwards, is a subclass of OSError), so try catching that, setting
>> 'host' to 'UnResolved' if it's raised.
>>
>> Also, try printing out ascii(os.environ['REMOTE_ADDR']).
>>
>
> I have followed your suggestion by trying this:
>
> try:
> 	host = socket.gethostbyaddr( os.environ['REMOTE_ADDR'] )[0]
> except socket.gaierror:
> 	host = "UnResolved"
>
> and then re-cloudlflared "superhost.gr" domain
>
> http://superhost.gr/ gives internal server error.
>
Try catching OSError instead. (As I said, from Python 3.3,
socket.gaierror is a subclass of it.)