Description

When using Sitecore Forms in a JSS application, the form cannot be submitted if the value of the serverSideRenderingEngineEditOnly app attribute is set to true. In this case, the request to /api/jss/formbuilder returns the not found page.

The issue affects Sitecore Headless Rendering 20.0.0.

Solution

To resolve the issue, consider either of the following options:

• Set the value of the serverSideRenderingEngineEditOnly app attribute to false.
• Patch the HeadlessSiteAccess processor so that it goes after TransferRoutedRequest:

  <httpRequestBegin>
      <processor type="Sitecore.JavaScriptServices.ViewEngine.Pipelines.HttpRequest.HeadlessSiteAccess, Sitecore.JavaScriptServices.ViewEngine" resolve="true" patch:after = "processor[@type='Sitecore.Pipelines.HttpRequest.TransferRoutedRequest, Sitecore.Mvc]" />
  </httpRequestBegin>
  

Note: The value of the app attribute, or the processor, must be patched by creating a configuration patch file in the \App_Config\Include\zzz folder.