feat: add request body support

Handle POST/PUT bodies with auto content-type

Author: maniac-en

internal/http/manager.go

@@ -1,7 +1,9 @@
 package http
 
 import (
+	"encoding/json"
 	"fmt"
+	"io"
 	"net/http"
 	"net/url"
 	"strings"
@@ -67,12 +69,22 @@ func (h *HTTPManager) ExecuteRequest(req *Request) (*Response, error) {
 	}
 
 	start := time.Now()
-	httpReq, err := http.NewRequest(strings.ToUpper(req.Method), requestURL, nil)
+
+	var body io.Reader
+	if req.Body != "" && (strings.ToUpper(req.Method) == "POST" || strings.ToUpper(req.Method) == "PUT" || strings.ToUpper(req.Method) == "PATCH") {
+		body = strings.NewReader(req.Body)
+	}
+
+	httpReq, err := http.NewRequest(strings.ToUpper(req.Method), requestURL, body)
 	if err != nil {
 		log.Error("failed to create HTTP request", "error", err)
 		return nil, fmt.Errorf("failed to create request: %w", err)
 	}
 
+	if body != nil {
+		h.setContentType(httpReq, req.Body)
+	}
+
 	if err := h.setHeaders(httpReq, req.Headers); err != nil {
 		log.Error("failed to set headers", "error", err)
 		return nil, fmt.Errorf("failed to set headers: %w", err)
@@ -126,3 +138,19 @@ func (h *HTTPManager) setHeaders(req *http.Request, headers map[string]string) e
 	}
 	return nil
 }
+
+func (h *HTTPManager) setContentType(req *http.Request, body string) {
+	if req.Header.Get("Content-Type") != "" {
+		return
+	}
+
+	body = strings.TrimSpace(body)
+	if strings.HasPrefix(body, "{") || strings.HasPrefix(body, "[") {
+		if json.Valid([]byte(body)) {
+			req.Header.Set("Content-Type", "application/json")
+			return
+		}
+	}
+
+	req.Header.Set("Content-Type", "text/plain")
+}

internal/http/manager_test.go

@@ -130,3 +130,26 @@ func TestSetHeaders(t *testing.T) {
 		t.Error("Content-Type header not set correctly")
 	}
 }
+
+func TestSetContentType(t *testing.T) {
+	manager := NewHTTPManager()
+
+	tests := []struct {
+		body     string
+		expected string
+	}{
+		{`{"key": "value"}`, "application/json"},
+		{`[1, 2, 3]`, "application/json"},
+		{"plain text", "text/plain"},
+	}
+
+	for _, test := range tests {
+		req, _ := http.NewRequest("POST", "https://example.com", nil)
+		manager.setContentType(req, test.body)
+
+		if req.Header.Get("Content-Type") != test.expected {
+			t.Errorf("for body %q, expected %q, got %q",
+				test.body, test.expected, req.Header.Get("Content-Type"))
+		}
+	}
+}