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

[Νίκος Γκρ33κ]

Στις 4/7/2013 4:34 μμ, ο/η MRAB έγραψε:
> 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.)
>

At least CloudFlare doesn't give me issues:

if i try this:

try:
	host = os.environ['REMOTE_ADDR'][0]
except socket.gaierror:
	host = "UnResolved"

then i get no errors and a valid ip back

but the above fails.

I don't know how to catch the exception with OSError.

i know only this two:

except socket.gaierror:
except socket.herror

both fail.

-- 
What is now proved was at first only imagined!