Basic curl & CORS Test & Preflight

curl is a pretty powerful tool which allows you to test endpoints.

• -X allows you to override method
• -o, --outputWrite output to file
• -I, --head Fetch the headers only!
• -H, --header Include header.

CORS: cross origin resource sharing.

curl --verbose \
-X POST https://us-central1-barnard-yiddish.cloudfunctions.net/addSuggestions \
-H 'content-type: application/json' \
-H "Origin: https://google.com/" \
-d '{
"english_word": "sun",
"translation": "太阳",
"transliteration": "taiyang",
"sound_link": "https://gcs/eiuDklsXy.mp3"
}'

If the return contains

Access-Control-Allow-Origin

Access-Control-Allow-Methods

Access-Control-Allow-Headers

Then it’s a good endpoint which allows CORS.