Added expand header

Added documentation

README.md

@@ -54,6 +54,13 @@ func ValidateWebhook(httpRequest *http.Request) bool {
 }
 ```
 
+### Expanding responses
+Many objects allow you to request additional information as an expanded response by using the expand header. This parameter is available on all API requests, and applies to the response of that request only. Checkout the [documentation](https://api.docs.ewarehousing-solutions.com/expanding-responses) for all possible options.
+```go
+ctx := context.Background()
+
+order, res, err := client.Orders.Get(context.WithValue(ctx, "Expand", "order_lines"))
+```
 
 ## Support
 

ewhs/ewhs.go

@@ -226,9 +226,9 @@ func (c *Client) NewRequest(ctx context.Context, method string, uri string, body
 	req.Header.Set(CustomerCodeHeader, c.config.CustomerCode)
 	req.Header.Set(WmsCodeHeader, c.config.WmsCode)
 
-	// TODO: allow expand headers
-	//if ctx.Value("Expand") != nil {
-	//}
+	if expand := ctx.Value("Expand"); expand != nil {
+		req.Header.Set("Expand", expand.(string))
+	}
 
 	// if no auth token is found -> authorize first
 	if c.authToken == "" && uri != "wms/auth/login/" {