Issue

When calling K2 workflow api:

https://k2.denallix.com/api/workflow/v1/workflows/xx

The following error is thrown:

"Maximum request length exceeded." or "An error has occurred."

Error Code

or

Resolution

The default MaxRequestLength set in IIS for workflow api site is 2 MB. You can add the following key in the <system.web> section in the web.config file to increase the size.

<httpRuntime maxRequestLength="16384" targetFramework="4.6.1" />

The web.config file is located in the following folder:

C:Program Files (x86)K2 blackpearlWebServicesAPIWorkflowV1

Please make a backup copy of the file before making changes.

Increasing this limit could potentially raise performance issues if the server does not have enough resources to process the request. 

Additional Information

https://help.nintex.com/en-US/k2five/userguide/5.4/default.htm#K2-Management-Site/Integration/Workflow-REST-API.htm?Highlight=workflow%20api

Related Links

https://community.nintex.com/t5/How-To/How-to-increase-the-Attachment-File-size-in-Sharepoint-2013-for/ta-p/101133