Are you using mod_wsgi embedded mode or daemon mode?

Graham

> On 11 Jan 2024, at 2:44 am, Greg Popp <pop...@gmail.com> wrote:
> 
> Hello!
> 
> My version of mod_wsgi is running on a Centos-7 system and is at version 3.4, 
> (I know - very old) with python 2.7
> 
> I have been using mod_wsgi for a python application that runs a command-line 
> program and marshals the output of the command line program back to an http 
> client. The data being sent is binary and can be tens of gigs in size.
> 
> This app is "unconventional", in that it calls 'write' directly, instead of 
> returning an iterable. The problem I have had recently, is that some clients 
> are slow to read the data and the TCP buffer gets filled up. When this 
> happens, the next call to write on a full buffer causes a "failed to write 
> data" exception (which I trap) but if I try again to send the data I get 
> "client connection closed".
> 
> Is there some config setting or methodology I can use to alleviate this 
> issue? In other words, some way to back off and wait for the buffer to drain 
> sufficiently to resume sending the data? OR - is there some way to get the 
> current size (fullness) of the TCP write buffer on the connected socket? 
> (Something like what you see from the 'ss' command line utility "Send-Q" 
> column). If I could tell how full it is and what the max size is, I could 
> implement a sleep/retry cycle of some kind.
> 
> I have looked - even in the source code - but haven't been able to figure it 
> out if there is a way to achieve this.  Thanks in advance, for your attention.
> 
> 
> 
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