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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: Reading only the first X bytes of the response stream
Date Sat, 03 Sep 2016 17:40:56 GMT
On Thu, 2016-09-01 at 12:10 -0400, Dan Quaroni wrote:
> I'm writing a utility that will retrieve some metadata about swf (flash)
> files and I'd like to use httpclient to read the data but I want clarity on
> the necessity to read the entire stream.
> 
> The information I need is all in the first few bytes of the file, and the
> files could potentially be quite large so I don't want to read them in
> their entirety.  I'd like to just read what I need and then close the
> connection.
> 
> Here's a little test snippet, note that SWFInfo is closing the input stream
> on the response entity:
> 
>     public static void main(String[] args) throws Exception {
> 
>         CloseableHttpClient client = buildCloseableClient();
>         HttpGet get = new HttpGet("http://localhost/Cat.swf");
>         for (int i = 0; i < 10000; i++) {
>             try (CloseableHttpResponse response = client.execute(get)) {
>                 SWFInfo info =
> SWFInfo.getInfo(response.getEntity().getContent());
>                 System.out.println(i + ": " + info.width + "," +
> info.height);
>             }
>         }
>     }
> 
> 
> This test executes successfully, suggesting that it's OK but I want to
> double check that I won't be causing any types of resource usage problems.
> Note that we're using HttpClient in other parts of our application, but
> those are pooled connections that are constructed differently.
> 
> 

Hi Dan

Your code looks OK to me. As long as one closes CloseableHttpResponse
there should be no resource leaks.

Oleg

> Thanks,
> 
> Dan



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