Revert "fix: remove only one whitespace from data prefix #1044 (#1075)"

This reverts commit 3b41b01.

Author: jeevatkm

sse.go

@@ -745,12 +745,8 @@ func trimHeader(size int, data []byte) []byte {
 		return data
 	}
 	data = data[size:]
-	if len(data) > 0 && data[0] == ' ' {
-		data = data[1:]
-	}
-	if len(data) > 0 && data[len(data)-1] == '\n' {
-		data = data[:len(data)-1]
-	}
+	data = bytes.TrimSpace(data)
+	data = bytes.TrimSuffix(data, []byte("\n"))
 	return data
 }
 

sse_test.go

@@ -323,25 +323,6 @@ func TestEventSourceNoRetryRequired(t *testing.T) {
 	assertEqual(t, true, strings.Contains(err.Error(), "400 Bad Request"))
 }
 
-func TestGH1044TrimHeader(t *testing.T) {
-	t.Run("data is nil", func(t *testing.T) {
-		result := trimHeader(0, nil)
-		assertNil(t, result)
-	})
-
-	t.Run("data has double whitespace", func(t *testing.T) {
-		data := []byte("data:  double whitespace message")
-		result := trimHeader(5, data)
-		assertEqual(t, true, result[0] == ' ')
-	})
-
-	t.Run("data has newline", func(t *testing.T) {
-		data := []byte("data: newline message\n")
-		result := trimHeader(5, data)
-		assertEqual(t, true, result[len(result)-1] != '\n')
-	})
-}
-
 func TestEventSourceHTTPError(t *testing.T) {
 	es := createEventSource(t, "", func(any) {}, nil)
 	ts := createTestServer(func(w http.ResponseWriter, r *http.Request) {