implement Post for the custom http client

pkg/httpclient/client.go

@@ -14,6 +14,7 @@ import (
 type IHttpClient interface {
 	Do(req *http.Request) (*http.Response, error)
 	Get(url string) (*http.Response, error)
+	Post(url, contentType string, body io.Reader) (resp *http.Response, err error)
 }
 
 // Client special http client that can throttle requests per seconds (RPS).
@@ -80,6 +81,15 @@ func (c *Client) incrRPS() {
 	}
 }
 
+func (c *Client) Post(url, contentType string, body io.Reader) (resp *http.Response, err error) {
+	req, err := http.NewRequest(http.MethodPost, url, body)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Content-Type", contentType)
+	return c.do(req)
+}
+
 func (c *Client) Get(url string) (*http.Response, error) {
 	return c.get(url)
 }