membphis commented on issue #3865:
URL: https://github.com/apache/apisix/issues/3865#issuecomment-803592575
@ShaoZeMing I listed an example to explain the reason.
Here are three routes(A, B and C), what is their priority?
I think you can talk to me A < B, and A < C, it seems fine.
Between B and C, who has the highest priority? I think it is not easy to
reply to this question.
The machine cannot accurately determine who has the higher priority at this
time.
```
### router A：only uri
{
"uris":[ "/*" ]
}
### router B ：uri + host
{
"uris":["/*"],
"hosts":["test-dev-1.apisix.xthktech.cn"]
}
### router B ： uri + header
{
"uris":["/*"],
"vars":[
[
"http_app-name",
"==",
"test-header"
]
]
}
```
In APISIX, when the URI is the same, additional priority needs to be set.
Here is an example, then we know that: B > C > A.
```
router A：only uri
{
"uris":[ "/*" ],
"priority": 0
}
router B ：uri + host
{
"uris":["/*"],
"hosts":["test-dev-1.apisix.xthktech.cn"],
"priority": 2
}
router C ： uri + header
{
"uris":["/*"],
"vars":[
[
"http_app-name",
"==",
"test-header"
]
],
"priority": 1
}
```
*note*: the default value of `priority` is zero.
https://github.com/apache/apisix/blob/master/docs/en/latest/admin-api.md#route
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