Re: NSURLConnection changing the URL
Re: NSURLConnection changing the URL
- Subject: Re: NSURLConnection changing the URL
- From: "Mohan Parthasarathy" <email@hidden>
- Date: Tue, 20 Jan 2009 16:49:25 -0800
On Tue, Jan 20, 2009 at 4:38 PM, Andrew Farmer <email@hidden> wrote:
> On 20 Jan 09, at 13:36, Mohan Parthasarathy wrote:
>
>> On Tue, Jan 20, 2009 at 1:23 PM, Andrew Farmer <email@hidden> wrote:
>>
>>> On 20 Jan 09, at 12:22, Mohan Parthasarathy wrote:
>>>
>>> I want to be able to establish the TCP connection to a server and do
>>>> multiple HTTP GETs with different URLs. I thought will achieve this by
>>>> allocating a NSURLConnection and then initWithRequest:urlRequest with a
>>>> different URL everytime as there is no other way to set the URL. It
>>>> looks
>>>> like that this is not working and the URL is not changing.
>>>>
>>>
>>> Initializing ObjC objects multiple times is always incorrect. Don't do
>>> it!
>>>
>>
>> Ok. Is it because init assumes that it is allocating memory for the first
>> time and hence may cause leaks if called multiple times ? At least it
>> seems
>> to work now.
>>
>
> Internally, any number of things may be happening during initialization.
> Calling the initializer multiple times on an object is invalid, and may
> result in memory leaks, crashes, or other incorrect behavior; moreover, even
> if it appears to work correctly in a given system version, there is no
> guarantee that it will continue to behave similarly in future versions of
> the OS. Even minor updates may change the behavior - it's undefined, and is
> under absolutely no obligation to remain constant.
>
> Seriously, don't do it.
Ok. Point taken.
>
>
> Is there a way to not to allocate the connection everytime i need to send
>>>> a new request ?
>>>>
>>>
>>> Yes. I'm pretty sure that the URL loading framework will use HTTP
>>> keepalives automatically when appropriate.
>>>
>>
>> I am not sure i undrstood this. If i allocate a NSURL connection
>> everytime
>> i need to fetch from a URL, wouldn't it set up a TCP connection everytime
>> and then download the data. If i can avoid that, wouldn't it be nice ?
>>
>
> Again, I'm pretty sure that the Cocoa URL loading functions will do this
> for you as appropriate. Trying to implement it yourself is unnecessary, and
> trying to go about it this particular way is futile as well as incorrect.
I don't want to do this myself. But i don't see anything in NSURLConnection
that would do this. If so, please point to me.
Thanks
mohan
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