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The following article in the SDL WorldServer 11.3 Developer Documentation provides an explanation on how to customize the REST API: https://docs.sdl.com/LiveContent/content/en-US/SDL%20WorldServer%20Developer%20Documentation-v1#addHistory=true&filename=GUID-316AC991-323A-4FE4-846D-C738A7182E45.xml&docid=GUID-834DC279-3978-4D27-A5F8-966BA0A8A679&inner_id=&tid=&query=&scope=&resource=&toc=false&eventType=lcContent.loadDocGUID-834DC279-3978-4D27-A5F8-966BA0A8A679.
For the most part the instructions are clear and easy to follow. However, there is one missing piece of information that would have been helpful to include.
One of the steps explains how to upload a .jar file containing custom REST API code. The step says the following:
"Upload the .jar file into WorldServer. Use any REST client you want. To upload the .jar file, make a POST request to <protocol>://<ws-host>:<ws-port>/ws-api/v1/customizations/api?token=<sessionId>. Use a form-data body."
I attempted to do this, but received the following error response: