Add golangci-lint

.github/workflows/test.yaml

@@ -27,7 +27,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Setup Go
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.go-version }}
 
@@ -36,3 +36,22 @@ jobs:
 
       - name: Test
         run: make test
+
+  golangci-lint:
+    name: golangci-lint
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: 1.22
+          cache: false
+
+      - name: GolangCI
+        uses: golangci/golangci-lint-action@v4
+        with:
+          version: v1.56.2

.golangci.yaml

@@ -0,0 +1,44 @@
+run:
+  timeout: 5m
+
+linters-settings:
+  errcheck:
+    check-type-assertions: true
+
+  forbidigo:
+    forbid:
+      - ^print.*$
+      - 'fmt\.Print.*'
+
+  gci:
+    sections:
+      - standard
+      - default
+      - prefix(github.com/userhubdev/go-sdk)
+      - blank
+      - dot
+    custom-order: true
+
+  gofmt:
+    rewrite-rules:
+      - pattern: 'interface{}'
+        replacement: 'any'
+
+  govet:
+    enable-all: true
+    disable:
+      - fieldalignment
+
+linters:
+  enable:
+    - errcheck
+    - forbidigo
+    - gci
+    - gofmt
+    - goimports
+    - govet
+    - misspell
+    - nilnil
+    - perfsprint
+    - unconvert
+    - whitespace

internal/request.go

@@ -48,7 +48,7 @@ func (r *Request) SetHeader(name, value string) {
 	if r.headers == nil {
 		r.headers = http.Header{}
 	}
-	r.SetHeader(name, value)
+	r.headers.Set(name, value)
 }
 
 func (r *Request) SetIdempotent(v bool) {