B4J Question Server B4j, how to measure real benefits parameter srvr.GzipEnabled = True

[Roberto P.]

Hi
in a data exchange between apps and servers, I've added srvr.GzipEnabled = True optimization.

I measured the size of the stream with and without parameter, but the dimensions are the same.

Here's how I measure the dimensions: Log("Numero di byes ricevuti dal server : " & j.GetInputStream.BytesAvailable)

This is the B4A code:

Sub ReadObject (In As InputStream) As Object
   Dim out As OutputStream
   out.InitializeToBytesArray(0)
   File.Copy2(In, out)
   Dim raf2 As RandomAccessFile
   raf2.Initialize3(out.ToBytesArray, False)
    Dim res As Object = raf2.ReadB4XObject(0) 
   raf2.Close
   Return

Is it correct or should I look on the other side?

 

[inakigarm]

Is the stream all the page content or only an object (a picture for ex? -If picture, maybe can't be compressed more
Which is the reason you want to compute exactly the compression ratio?
https://betterexplained.com/articles/how-to-optimize-your-site-with-gzip-compression/

 

[Roberto P.]

Is the stream all the page content or only an object (a picture for ex? -If picture, maybe can't be compressed more
Which is the reason you want to compute exactly the compression ratio?
https://betterexplained.com/articles/how-to-optimize-your-site-with-gzip-compression/

I'm importing binary data, list objects, and data maps. no images

I want to measure the real benefits of compression.

 

[alwaysbusy]

Is one of it a file? You could try to zip it manually and see how much it compresses because it can be significant (e.g. for css file 300kb can easily become sending over only 20k)

 

[inakigarm]

I'm importing binary data, list objects, and data maps. no images

I want to measure the real benefits of compression.

Maybe, for some reason, gzip isn't enabled or the code isn't correct. Can you test if its enabled on http://www.gidnetwork.com/tools/gzip-test.php for ex?

 

[OliverA]

Is it correct or should I look on the other side?

No. Both the server and the client take care of compressing / uncompressing. You're insulated from the process. The object that you get back is already uncompressed for you.

 

[inakigarm]

Off-topic:
I've to enable gzip on this webapp !! 83% compression ratio !

 

[Roberto P.]

data exchange is done with a procedure not with a browser. The data is transmitted with B4XSerializator

 

[OliverA]

@Erel's answer here (https://www.b4x.com/android/forum/t...e-database-connector.61801/page-5#post-456003): Yes. B4XSerializator compresses the data while it converts the objects to bytes.

So different methodology (B4XSerializator vs HTTP), but same concept (it's taken care of for you).

Edit: That is probably why you are not seeing any differences in enabling Gzip. It's already compressed, therefore Gzip will not give you the results expected (may actually make it a tad larger).

 

[mindful]

I think the srvr.GzipEnabled feature will encode only static files and for sure it does it on the fly so is better to use already gzipped files (as abmaterial does it) and set staticfilesoptions with setting gzip=true (so that the server knows that will use gziped files)....

 

[mindful]

I am not at the pc right now but you can look at github as jServer library is published there and see what exactly GzipEnabled does.

 

[OliverA]

@Erel sets an GzipHandler(). Therefore I'm pretty sure this allows for the compression of dynamic pages.

Code:

public void setGzipEnabled(boolean b) {
        if (b) {
            gzipHandler = new GzipHandler();
            gzipHandler.setIncludedMethods(HttpMethod.POST.toString(), HttpMethod.GET.toString());
        } else {
            gzipHandler = null;
        }
}