Haproxy route and rewrite based on URI path

Question

I am trying to setup an Haproxy to load balance requests on a few backends identified by the uri path. For example: https://www.example.com/v1/catalog/foo/bar Should lead to the "catalog-v1" backends. Thing is each app responds on a different path so I must not only identify the app but rewrite the URL path. E.g. - https://www.example.com/v1/catalog/product - https://www.example.com/v2-2/checkout/cart/123 - https://www.example.com/v3.1.2/checkout/cart TO - https://www.example.com/catalog-v1/product - https://www.example.com/checkout-v2-2/cart/123 - https://www.example.com/checkout-v3.1.2/cart I know I shouldn't use Haproxy for rewriting purposes but for now this is inevitable. Tried the following regex which worked on regex101: ``` ([a-z.]*)\/([a-z0-9\-\.]*)\/([a-z\-]*)\/(.*) ``` Substitution: ``` \1/\3-\2/\4 ``` And finally here's the haproxy.config: ``` global daemon user root group root maxconn 256000 log 127.0.0.1 local0 log 127.0.0.1 local1 notice stats socket /run/haproxy/stats.…

Accepted Answer

If I understand you correctly, replace the example below:

```
reqrep ^([^\ ]\*)\ /([-.0-9A-Za-z]\*)/([a-zA-Z]\*)/(.\*)  \1\ /\3-\2/\4
```

http://cbonte.github.io/haproxy-dconv/configuration-1.5.html#reqrep

```
reqrep search string [{if | unless} cond]
```

You have no spaces.

Haproxy route and rewrite based on URI path

Solution

Problem