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Clarify how setting a frontend priority works #2984

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Mar 12, 2018
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Clarify how setting a frontend priority works #2984

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7afed0c
Clarify how setting a frontend priority works
jbdoumenjou Mar 8, 2018
dbd9765
Fix for review
jbdoumenjou Mar 8, 2018
18071ba
Fix for review
jbdoumenjou Mar 12, 2018
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9 changes: 4 additions & 5 deletions docs/basics.md
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Expand Up @@ -234,27 +234,26 @@ The following rules are both `Matchers` and `Modifiers`, so the `Matcher` portio
#### Priorities

By default, routes will be sorted (in descending order) using rules length (to avoid path overlap):
`PathPrefix:/12345` will be matched before `PathPrefix:/1234` that will be matched before `PathPrefix:/1`.
`PathPrefix:/foo;Host:foo.com` (length == 28) will be matched before `PathPrefixStrip:/foobar` (length == 23) will be matched before `PathPrefix:/foo,/bar` (length == 20).

You can customize priority by frontend. The priority value is added to the rule length during sorting:
You can customize priority by frontend. The priority value override the rule length during sorting:

```toml
[frontends]
[frontends.frontend1]
backend = "backend1"
priority = 10
priority = 20
passHostHeader = true
[frontends.frontend1.routes.test_1]
rule = "PathPrefix:/to"
[frontends.frontend2]
priority = 5
backend = "backend2"
passHostHeader = true
[frontends.frontend2.routes.test_1]
rule = "PathPrefix:/toto"
```

Here, `frontend1` will be matched before `frontend2` (`(3 + 10 == 13) > (4 + 5 == 9)`).
Here, `frontend1` will be matched before `frontend2` (`20 > 16`).

#### Custom headers

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