Header matching
Specify a set of headers which requests must match in entirety.
For example, if you specify a set of headers in a route table for service B, a request from service A in your mesh to service B must contain the entire set of headers in order for the request to be routed. For other methods of request matching, see Match incoming requests.
Configuration
In a RouteTable resource, add the following matchers section to your route:
...
http:
- matchers:
- headers:
- name: <header_name>
value: <header_value>
regex: <true|false>
invertMatch: <true|false>
...
| Field | Description |
|---|---|
| name | The name of the header in the request. |
| value | The value of the header. If you omit this value, requests that have the header name match regardless of the header’s value. |
| regex | Whether the header value is written as a regular expression. Defaults to false. |
| invertMatch | If set to true, the result of the match is inverted, or only match if the string is not found. Defaults to false. |
For more information, see the Gloo Mesh API docs for route tables and for request matching.
Examples
For example, consider the following route table.
apiVersion: networking.gloo.solo.io/v2
kind: RouteTable
metadata:
name: headers-match
namespace: global
spec:
hosts:
- 'myapp.global.svc.cluster.local'
http:
- matchers:
- headers:
- name: <header_name>
value: <header_value>
regex: <true|false>
invertMatch: <true|false>
forwardTo:
destinations:
- ref:
name: myapp
namespace: global
cluster: ${REMOTE_CLUSTER1}
port:
number: 8090
kind: SERVICE
To achieve the following example request matches, you might use these combinations of headers settings. Remember that requests must match all specified headers.
Match only header name: Requests to the host that include the header named X-route-to-myapp are routed to the myapp destination.
- headers:
- name: X-route-to-myapp
Match header name and value: Requests to the host that include the header X-route-to-myapp: v1 are routed to the myapp destination.
- headers:
- name: X-route-to-myapp
value: "v1"
Match header name and regex-defined value: Requests to the host that include headers such as X-route-to-myapp: v1 or X-route-to-myapp: v3 are routed to the myapp destination.
- headers:
- name: X-route-to-myapp
value: v.*
regex: true
Match anything except header name and value: Requests to the host that do not include the header X-route-to-myapp: v1 are routed to the myapp destination. Note that requests including headers such as X-route-to-myapp: v2 are matched and forwarded.
- headers:
- name: X-route-to-myapp
value: "v1"
invertMatch: true
Next steps
Check out the guides in Forward requests to a destination to further build your route tables based on the destination type, and apply the route tables to your ingress gateway.