Force the string value for the header setting.

execute_query.go

@@ -18,7 +18,11 @@ func (qe *QueryExecutor) executeQuery() ([]byte, error) {
 	}
 
 	for key, value := range qe.Headers {
-		httpRequest.Header.Set(key, value.(string))
+		strValue, ok := value.(string)
+		if !ok {
+			strValue = fmt.Sprintf("%v", value)
+		}
+		httpRequest.Header.Set(key, strValue)
 	}
 
 	var retries_max int

main.go

@@ -11,7 +11,7 @@ import (
 func NewConnection() (b *BaseClient) {
 	b = &BaseClient{
 		endpoint:       envutil.Getenv("GRAPHQL_ENDPOINT", "https://api.github.com/graphql"),
-		responseType:   envutil.Getenv("GRAPHQL_RESPONSE_TYPE", "string"),
+		responseType:   envutil.Getenv("GRAPHQL_OUTPUT", "string"),
 		Logger:         logging.NewLogger(),
 		cache:          cache.New(time.Duration(envutil.GetInt("GRAPHQL_CACHE_TTL", 5)) * time.Second),
 		cache_global:   envutil.GetBool("GRAPHQL_CACHE_ENABLED", false),