feat!: enhance credentials usage and update warning message for crede…

…ntials requests

client.go

@@ -76,6 +76,8 @@ var (
 	jsonKey = "json"
 	xmlKey  = "xml"
 
+	defaultAuthScheme = "Bearer"
+
 	hdrUserAgentValue = "go-resty/" + Version + " (https://github.com/go-resty/resty)"
 	bufPool           = &sync.Pool{New: func() any { return &bytes.Buffer{} }}
 )

middleware.go

@@ -312,11 +312,7 @@ func addCredentials(c *Client, r *Request) error {
 	// Build the token Auth header
 	if !isStringEmpty(r.AuthToken) {
 		credentialsAdded = true
-		authScheme := r.AuthScheme
-		if isStringEmpty(authScheme) {
-			authScheme = "Bearer"
-		}
-		r.RawRequest.Header.Set(c.HeaderAuthorizationKey(), authScheme+" "+r.AuthToken)
+		r.RawRequest.Header.Set(c.HeaderAuthorizationKey(), r.AuthScheme+" "+r.AuthToken)
 	}
 
 	if !c.IsDisableWarn() && credentialsAdded {

resty.go

@@ -163,6 +163,7 @@ func createClient(hc *http.Client) *Client {
 		queryParams:              url.Values{},
 		formData:                 url.Values{},
 		header:                   http.Header{},
+		authScheme:               defaultAuthScheme,
 		cookies:                  make([]*http.Cookie, 0),
 		retryWaitTime:            defaultWaitTime,
 		retryMaxWaitTime:         defaultMaxWaitTime,