Use application/json for Content-Type header in health handler (#221)

* Use application/json for Content-Type header in health handler

* Remove actions/cache usage since actions/setup-go@v4 already caches by default

.github/workflows/ci.yaml

@@ -17,17 +17,11 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v4
         with:
-          go-version: '1.20'
-      - uses: actions/cache@v3
-        with:
-          path: ~/go/pkg/mod
-          key: ${{ runner.os }}-go-v1-${{ hashFiles('**/go.sum') }}
-          restore-keys: |
-            ${{ runner.os }}-go-v1-
+          go-version: "1.20"
       - name: tests
         run: scripts/cibuild
       - name: Generate Foresight test data
-        run: go test -v -json -coverprofile=coverage.out ./...> ./test-report.json || true 
+        run: go test -v -json -coverprofile=coverage.out ./...> ./test-report.json || true
       - name: Analyze Test and/or Coverage Results
         uses: runforesight/foresight-test-kit-action@v1
         if: success() || failure()
@@ -43,4 +37,4 @@ jobs:
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: coverage.out
-          flags: micro
+          flags: micro

health/README.md

@@ -19,7 +19,7 @@ Healthy service example (using the [httpie](https://httpie.org/) command line ut
 http http://localhost:8083/livez
 HTTP/1.1 200 OK
 Content-Length: 109
-Content-Type: text/plain; charset=utf-8
+Content-Type: application/json
 Date: Mon, 17 Jan 2022 23:23:12 GMT
 
 {
@@ -38,7 +38,7 @@ Unhealthy service:
 http http://localhost:8083/livez
 HTTP/1.1 503 Service Unavailable
 Content-Length: 113
-Content-Type: text/plain; charset=utf-8
+Content-Type: application/json
 Date: Mon, 17 Jan 2022 23:23:20 GMT
 
 {

health/handler.go

@@ -10,6 +10,7 @@ import (
 // response status is 200 if chk.Check() returns a nil error, 503 otherwise.
 func Handler(chk Checker) http.HandlerFunc {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
 		h, healthy := chk.Check(r.Context())
 		b, _ := json.Marshal(h)
 		if healthy {