Compress on client

WEB TMS WEB Core
1

Hi,

It is possible to compress a string(JSON) on the client side before sending it to the server?

Any hints?

thanks in advance,

Omar Zelaya

2

There is at this moment not a function in TMS WEB Core built-in for compressing text.
Maybe this is an interesting JavaScript library you can use client-side for this:

3

Hi,

Thanks for the tip. Do you know any similar for Brotli compression.

Thanks in avance,

Omar Zelaya

4
5

Hi,

Any hint how to compess content for XData server can uncompress it automatically?

On VCL I use the following
HttpClient.OnSendingRequest := procedure(Req: THttpRequest)
begin
...
LZip := TZCompressionStream.Create(clDefault, OutStream);
LZip.Write(Req.ContentBuffer^, Req.ContentLength);
LZip.Free;
SetLength(NewContent,OutStream.Size);
Move(OutStream.Bytes[0],NewContent[0],OutStream.Size);
Req.SetContent(NewContent);
Req.Headers.SetValue('content-encoding','deflate');
...
end;

Thanks in advance,

Omar Zelaya

7

There is no equivalent for that from TMS Web Core applications.

8

Hi,

On event XDataWebConnection.OnRequest ther is now to way to access Args.Request.Content(Content buffer) to compess it using a java lib, modify the request content buffer and set the required headers?

Thanks in advance,

Omar Zelaya

9

Yes, you can do that, but that's up to you, there is no built-in routines for compressing. But yes, you can simply set the Content property of the request to a new value.

10

Hi,

Can you please provide a code sample or hint on how to modifiy the content. I have checked Args.Request.Content and is a JSValue Variable.

Thanks in advance,

Omar Zelaya

11

A JSValue can simply receive anything. Just set any value to it and that's what is going to be used in the internal xhr.send method, as explained here:

How to compress the data and get the value is up to you.