How do I send a OPTIONS request using Curl?
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Angular 6 HttpClient OPTIONS request "pending" when response code is not 204. · Issue #24383 · angular/angular · GitHub
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Multiple Ways to Detect HTTP Options
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CORSのプリフライトリクエスト（OPTIONメソッド）はAPI Keyの認証なしでOKにしておかないと失敗する話 | フューチャー技術ブログ
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Multiple Ways to Detect HTTP Options
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Java on Twitter: "HTTP Options Request Handler Example with Spring REST @HowToDoInJava https://t.co/vEOtH1eJID https://t.co/EjPpI1ar1Z" / Twitter
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CURL ($curl) request using UiPath Studio Activities - Studio - UiPath Community Forum
API Umbrella to add X-Api-Key header when OPTIONS request is handled · Issue #391 · NREL/api-umbrella · GitHub
