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docs/ALTSVC.md: first basic file format description

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bagder committed Aug 7, 2019
1 parent eb63b27 commit 2bdb26a507194e3fca08b3ed2a27becf222a517c
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  1. +21 −0 docs/ALTSVC.md
@@ -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)

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