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bcquality/microsoft/knowledge/ui/control-addin-package-resource-ajax-needs-withcredentials.md
Jesper Schulz-Wedde cf55246ecf Add P0 integration and control add-in guidance 
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 02baffe8-0600-430d-81fa-a9993685e7cb
2026-07-14 12:19:22 +02:00

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bc-version domain keywords technologies countries application-area
all
ui
control-add-in
packaged-resource
ajax
withcredentials
xhrfields
jquery
javascript
w1
all

Load packaged control add-in resources with credentialed AJAX

Description

JavaScript in a Business Central control add-in can load a static resource from its extension package with AJAX, but the request needs the Business Central context and cookies. Set xhrFields.withCredentials = true; shorthand calls such as $.get omit that setting and can work during development yet fail in production.

Best Practice

Use an AJAX form that explicitly enables withCredentials whenever a control add-in requests a packaged static resource. Keep this rule scoped to resources served from the add-in package; it is not generic advice to attach credentials to arbitrary external requests.

See sample: control-addin-package-resource-ajax-needs-withcredentials.good.js.

Anti Pattern

Using $.get(url) or an XMLHttpRequest without withCredentials = true to retrieve package content. The request can lack the context and cookies required by the Business Central service.

See sample: control-addin-package-resource-ajax-needs-withcredentials.bad.js.

Source

Control add-in object: Loading static resources using AJAX requests.