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Why does my JavaScript code receive a "No 'Access-Control-Allow-Origin' header is present on the requested resource" error, while Postman does not?

javascriptjquerycorssame-origin-policyflask-restless
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XMLHttpRequest cannot load XXX No 'Access-Control-Allow-Origin' header

javascriptcorssame-origin-policy
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How does Access-Control-Allow-Origin header work?

javascriptcorscross-domain
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No 'Access-Control-Allow-Origin' header is present on the requested resource—when trying to get data from a REST API

javascriptcorsfetch-apipreflight
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"Cross origin requests are only supported for HTTP." error when loading a local file

javascriptfilecorshttpthree.js
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commandbuttonzshgrid-layoutpessimistic-lockingpackage.jsondecodepageobjectsinstallationdjango-usersfirefox-addon-webextensionsfirebase-securityxpathmemory-addressmmsindexoutofboundsexceptionandroid-gridviewbackgroundbinary-operatorscanvasnonetype