Hebrew - fetch - Request path contains unescaped characters

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hi,
i’m using this fetch API article and i have an issue
https://support.wix.com/en/article/corvid-accessing-third-party-services-with-the-fetch-api
i’m using Hebrew language as parameter and i get:
jsonPayload: {message: “Request path contains unescaped characters”}
message: “Request path contains unescaped characters”

its when i using the backend script

any idea what can i do?