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- Long: etag-save
- Arg: <file>
- Help: Parse ETag from a request and save it to a file
- Protocols: HTTP
- Added: 7.68.0
- ---
- This option saves an HTTP ETag to the specified file. Etag is
- usually part of headers returned by a request. When server sends an
- ETag, it must be enveloped by a double quote. This option extracts the
- ETag without the double quotes and saves it into the <file>.
- A server can send a week ETag which is prefixed by "W/". This identifier
- is not considered, and only relevant ETag between quotation marks is parsed.
- It an ETag wasn't send by the server or it cannot be parsed, and empty
- file is created.
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