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docs/ALTSVC.md: first basic file format description

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Daniel Stenberg 2019-08-07 14:18:42 +02:00
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@ -57,3 +57,24 @@ Experimental support in curl means:
- using `Age:` value for caching age as per spec
- `CURLALTSVC_IMMEDIATELY` support
- `CURLALTSVC_ALTUSED` support
# Alt-Svc cache file format
This a text based file with one line per entry and each line consists of nine
space separated fields.
## Example
h2 quic.tech 8443 h3-22 quic.tech 8443 "20190808 06:18:37" 0 0
## Fields
1. The ALPN id for the source origin
2. The host name for the source origin
3. The port number for the source origin
4. The ALPN id for the destination host
5. The host name for the destination host
6. The host number for the destination host
7. Within double quotes, the expiration date of this entry
8. Boolean (1 or 0) if "persist" was set for this entry
9. Integer priority value (not currently used)