restbridgeclient doesn't do 'GET'
lazarus / 76-Pas2JS

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rca · 2024-06-29 05:54

I am working with example restbridgeclient (pasjs demo) and restserver
(Lazarus demo) from sqldbrest.

When using jsonclient (Lazarus demo) it works OK and the server shows:
Code: Bash  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i [Resource]
(User: ?) Resource: metadata; Operation: GET[Connection] (User: ?)
Using connection to Host: localhost; Database:
expensetracker[Authentication] (User: me) Authenticated user:
me[Result] (User: me) Resource: metadata; Operation: GET; Status: 200;
Text: OK
However, when using restbridgeclient example (pasjs demo), it doesn't
work and the server shows:
Code: Bash  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i [Result]
(User: ?) Resource: metadata; Operation: OPTIONS; Status: 403; Text:
FORBIDDEN
The difference is in the Operation, it should be 'GET', but it sends
'OPTIONS'.

In the unit sqldbrestdataset, there is the "constructor
TServiceRequest.Create", if I comment the following line of code Code:
Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
FXHR.setRequestHeader('Authorization', 'Basic
'+window.btoa(aUserName+':'+aPassword));it sends the 'GET' method, but
obviously it would not be authenticated and still does not work.

Please can you help me solve it?

Thank you

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rca · 2024-07-01 13:57

After finding and reading some information:
https://stackoverflow.com/questions/63752007/axios-request-method-
changes-to-options-instead-of-get
https://stackoverflow.com/questions/21783079/ajax-in-chrome-sending-
options-instead-of-get-post-put-delete
https://stackoverflow.com/questions/29954037/why-is-an-options-
request-sent-and-can-i-disable-it

In short, it not only happens with the 'GET' method, it will also
happen with 'POST', 'PUT' or 'DELETE'.

"OPTIONS request is part of the so-called preflight request which is
needed to figure out the CORS headers to know what needs/is allowed to
be sent to the server with the actual request."

More details about "Cross-Origin Resource Sharing (CORS)"
https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
"CORS preflight"
https://developer.mozilla.org/en-US/docs/Glossary/Preflight_request

So the solution is on the server side (restserver Lazarus demo),
within Dispatcher options, enable "rdoHandleCORS" (Handle CORS
requests) and that's it!

Enjoy!