Query, Header Default Value Tag Feature

app.go

@@ -144,6 +144,12 @@ type Config struct {
 	// Default: false
 	CaseSensitive bool `json:"case_sensitive"`
 
+	// When set to true, this will add a default value tag support to all parsers.
+	// This will allow you to set default values for query, path, and body parameters.
+	//
+	// Default: false
+	DefaultValueParser bool `json:"default_value_parser"`
+
 	// When set to true, this relinquishes the 0-allocation promise in certain
 	// cases in order to access the handler values (e.g. request bodies) in an
 	// immutable fashion so that these values are available even if you return

ctx.go

@@ -506,6 +506,10 @@ func (c *Ctx) Cookies(key string, defaultValue ...string) string {
 
 // CookieParser is used to bind cookies to a struct
 func (c *Ctx) CookieParser(out interface{}) error {
+	if c.app.config.DefaultValueParser {
+		utils.SetDefaultValues(out)
+	}
+
 	data := make(map[string][]string)
 	var err error
 
@@ -1249,6 +1253,10 @@ func (c *Ctx) QueryFloat(key string, defaultValue ...float64) float64 {
 
 // QueryParser binds the query string to a struct.
 func (c *Ctx) QueryParser(out interface{}) error {
+	if c.app.config.DefaultValueParser {
+		utils.SetDefaultValues(out)
+	}
+
 	data := make(map[string][]string)
 	var err error
 
@@ -1308,6 +1316,10 @@ func parseParamSquareBrackets(k string) (string, error) {
 
 // ReqHeaderParser binds the request header strings to a struct.
 func (c *Ctx) ReqHeaderParser(out interface{}) error {
+	if c.app.config.DefaultValueParser {
+		utils.SetDefaultValues(out)
+	}
+
 	data := make(map[string][]string)
 	c.fasthttp.Request.Header.VisitAll(func(key, val []byte) {
 		k := c.app.getString(key)