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Alan ChangAlan Chang 

Why does REST request using ETag If-Match always return 412?

When testing ETag If-Match on sobject Account, I found no matter what entity value is assigned to HTTP Header If-Match, the REST API always returns 412 code in both GET and PATCH methods. Can you explain if this is a known issue or something i did wrong?
Here is the url i used in postman: https://na35.salesforce.com/services/data/v39.0/sobjects/Account/0014100000QHDoNAAX
HTTP Headers:
Authorization:Bearer 00D41000002lPY1!ARgAQJ6GUvAHAFi2A5vLDm8hewP9njTHFaI_kQMcZQRvg4bQD2nBQIM6KaknppPNmcZP_4XZU0Qus39OQbaa_l0b45Ln3Qhs
Content-Type:application/json
If-Match:"llQbn4wyMNQw122nBsPUwPQXf0Q=--gzip"