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Thread How call a webserver from same host
Thu, Nov 15 2012 8:59 AMPermanent Link

pedrini.franck

Axima srl


Hello
I'am make a delphi webservice , with indy httpserver .
This webserver send to EWB a Json get
I deploy my EWB application on EWB webserver (localhost port 88) (same problem with IIS/)
my delphi webserver run on (localhost port 88)

When call my function http://localhost:88/CLI_LST form browser , return data ,
when call my function from EWB client-application
     // chiama clienti
    if Tbutton(sender).caption='CaricaClienti' then
    begin
     WSfunz:='CaricaClienti';
    ServerRequest1.URL := 'http://localhost:88/CLI_LST';
    ServerRequest1.Method := rmGet;
    ServerRequest1.Execute;
    end;
 Don't work
When call my function diretly from IDE (Run F9) work

Thank you
Thu, Nov 15 2012 9:20 AMPermanent Link

Raul

Globestar Systems

Team Elevate Team Elevate


I'm little confused as you seem to be referring to port 88 for ewb
webserver/IIS as well as your delphi webserver?! I assume one of them is
port 80 and other port 88.

In that case the issue is that you're actually not on the same host from
perspective of Javascript - it's the classic cross domain scripting
scenario - basically javascript can only make requests to the domain it
was loaded from.

Your options are :
1. Allow cross-origin sharing from your web service (see also EWB
general newsgroup for some posts on this - cross domain is the keyword).
You need to add Access-Control-Allow-Origin basically to your web service.

2. Have your delphi web service also serve the html/js files so there is
no cross domain issues.

Raul


On 11/15/2012 8:59 AM, pedrini.franck wrote:
>   Hello
>   I'am make a delphi webservice , with indy httpserver .
>   This webserver send to EWB a Json get
>   I deploy my EWB application on EWB webserver (localhost port 88) (same problem with IIS/)
>   my delphi webserver run on (localhost port 88)
>
>   When call my function http://localhost:88/CLI_LST form browser , return data ,
>   when call my function from EWB client-application
>        // chiama clienti
>       if Tbutton(sender).caption='CaricaClienti' then
>       begin
>        WSfunz:='CaricaClienti';
>       ServerRequest1.URL := 'http://localhost:88/CLI_LST';
>       ServerRequest1.Method := rmGet;
>       ServerRequest1.Execute;
>       end;
>    Don't work
>   When call my function diretly from IDE (Run F9) work
>
>   Thank you
>
Thu, Nov 15 2012 10:32 AMPermanent Link

pedrini.franck

Axima srl

 
 Hello raul

 sorry for 80..88
 I change my configurazione
 The DelphiWebservice now is on http:\\192.168.150.30:88
 The EWBwebserver is on my localhost port 80  (my pc is 192.168.150.103)

 I open un firefox browser call my function http://192.168.150.30:88/CLI_LST
 and i riceve  data

 I call my ewb application with firefox http://localhost/x6mobileprd.HTML
 see the form , click the button wich call my function
  ServerRequest1.URL := 'http://192.168.150.30:88/CLI_LST';
  ServerRequest1.Method := rmGet;
  ServerRequest1.Execute;
 Request.ResponseContent.text is empty
 
 ???
Thu, Nov 15 2012 11:08 AMPermanent Link

Raul

Globestar Systems

Team Elevate Team Elevate

As i said before this is classic cross domain scripting:

"192.168.150.30:88" and "192.168.150.30:80" are considered different
domains from javascript perspective (it does not matter that they run on
same computer and IP).

If your javascript app is accessed using 192.168.150.30:80 then it can
ONLY access resources from 192.168.150.30:80 by default.

If you require access to resrouces (web service) on 192.168.150.30:88
then that web service must at the very least return
Access-Control-Allow-Origin header.

Raul



On 11/15/2012 10:32 AM, pedrini.franck wrote:
>
>    Hello raul
>
>    sorry for 80..88
>    I change my configurazione
>    The DelphiWebservice now is on http:\\192.168.150.30:88
>    The EWBwebserver is on my localhost port 80  (my pc is 192.168.150.103)
>
>    I open un firefox browser call my function http://192.168.150.30:88/CLI_LST
>    and i riceve  data
>
>    I call my ewb application with firefox http://localhost/x6mobileprd.HTML
>    see the form , click the button wich call my function
>     ServerRequest1.URL := 'http://192.168.150.30:88/CLI_LST';
>     ServerRequest1.Method := rmGet;
>     ServerRequest1.Execute;
>    Request.ResponseContent.text is empty
>
>    ???
>
Thu, Nov 15 2012 11:37 AMPermanent Link

pedrini.franck

Axima srl


 OK ,  thank very much Raul
 
Thu, Nov 15 2012 12:37 PMPermanent Link

pedrini.franck

Axima srl

 How i do insert this command in EWB IDE
 on form1.create ?
context.Response.Headers.Add("Access-Control-Allow-Origin: "+origin);

 
Thu, Nov 15 2012 3:04 PMPermanent Link

Raul

Globestar Systems

Team Elevate Team Elevate

> On 11/15/2012 12:37 PM, pedrini.franck wrote:>    How i do insert
this command in EWB IDE
>    on form1.create ?
> context.Response.Headers.Add("Access-Control-Allow-Origin: "+origin);

Question as posed does not make sense (this are headers so they only are
needed for web requests, not EWB apps). Secondly the line you're showing
is for delphi (i think indy 9).

You need to modify your web service (that you said you wrote in delphi)
and it has to return the "Access-Control-Allow-Origin" header, not EWB app.

EWB can include Origin header in the request but i think that is
returned automatically.

For now i suggest just add "Access-Control-Allow-Origin: *" to your
header - this will basically allow any domain to access your web servie
for cross domain access - later on you can limit it to specific domains.
Using the "origin" value from request header as the response here would
be same as allowing any domain anyways.

How to send it specifically will depend on what you wrote your web
service in exactly.

If you're using indy10 http server then it's something like
AResponseInfo.CustomHeaders.Add('Access-Control-Allow-Origin: *');

If you wrote your own module in EWB web server then
ResponseHeaders.Add('Access-Control-Allow-Origin: *'); should do the same

Raul






Thu, Nov 15 2012 4:14 PMPermanent Link

pedrini.franck

Axima srl


Excuse me, but they are my first experience with EWB, and did not understand why it worked with explorer, but not with firefox / chrome

Thanks again Raul
Thu, Nov 15 2012 4:28 PMPermanent Link

Raul

Globestar Systems

Team Elevate Team Elevate

No problem - feel free to always ask.

EWB makes things look like Delphi/Pascal but underneath it's all
javascript and web requests so things are often different.

Tim has produced a pretty good manual for EWB and the "using server
requests" i think is a good writeup on general process :

http://www.elevatesoft.com/manual?action=topics&id=ewb1&section=using_server_requests

Raul

On 11/15/2012 4:14 PM, pedrini.franck wrote:
> Excuse me, but they are my first experience with EWB, and did not understand why it worked with explorer, but not with firefox / chrome
>
>    Thanks again Raul
>
Fri, Nov 16 2012 5:28 AMPermanent Link

Chris Holland

SEC Solutions Ltd.

Avatar

Team Elevate Team Elevate

I found exactly the same problem when I had cross site scripting to Load
data tables. It worked with IE but not with Chrome or Firefox.

The reason is because IE doesn't care and just does it, but Chrome will
send an "Access-Control-Allow-Origin" header before passing the actual
request. This header is added automatically by Chrome because it has
detected cross site scriting.

I modified my web server to return a confirmation to the
 "Access-Control-Allow-Origin" message to confirm that it was in fact
allowed, but EWB sees some kind of response to this "allow" message that
is not what it was expecting and throws a data response error.

I am unsure why sending a header response to confirm access control
returns data to EWB, but it does appear to and this is what cause the
problem.

Chris Holland
[Team Elevate]

On 15/11/2012 21:14, pedrini.franck wrote:
> Excuse me, but they are my first experience with EWB, and did not understand why it worked with explorer, but not with firefox / chrome
>
>    Thanks again Raul
>
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