chi

Chi - Example correlation id middleware usage

creates a chi router, listening on port 300, sets up the correlation id middleware and registers the handlers

Build the server

From the project root

go build cmd/examples/chi/chi.go

Run the server

./chi

Curl, containing NO correlation id in the request

Curl the server, with headers flag enabled, with no correlation id, one will be created and added to the response

curl -i localhost:3000/hello

The server returns the correlation id header (in the example, named my-trace-header, but this is configurable) and value in the response headers (and, in this case, in the body)

HTTP/1.1 200 OK
My-Trace-Header: b63a65cc-20fa-4b17-97ad-b796bdb6d338      <--- correlation id header
Date: Thu, 01 Jun 2023 01:13:22 GMT
Content-Length: 107
Content-Type: text/plain; charset=utf-8

Hello World!
correlation id header in  = 
correlation id header out = b63a65cc-20fa-4b17-97ad-b796bdb6d338

Curl, with a correlation id in the request

Curl the server, adding in the correlation id header

curl -i localhost:3000/hello -H "my-trace-header: hello-world-1"

The server will return the correlation id header and value in the response headers (and, in this case, in the body)

HTTP/1.1 200 OK
My-Trace-Header: hello-world-1      <--- correlation id header
Date: Thu, 01 Jun 2023 01:14:38 GMT
Content-Length: 97
Content-Type: text/plain; charset=utf-8

Hello World!
correlation id header in  = hello-world-1
correlation id header out = hello-world-1