Set user agent in getting HTTP status code

Close #8

src/configloader/HttpGetStatusCode.go

@@ -0,0 +1,28 @@
+package configloader
+
+import (
+    "net/http"
+)
+
+// Returns the HTTP status code for a url while sending requests using
+// a user-agent specific to the app.
+func HttpGetStatusCode(url string) (int, error) {
+
+    // create HTTP request
+    req, err := http.NewRequest("GET", url, nil)
+    if err != nil {
+        return 0, err
+    }
+
+    // set User-Agent header
+    req.Header.Set("User-Agent", "museum-digital-uploader")
+
+    resp, err := http.DefaultClient.Do(req)
+    if err != nil {
+        return 0, err
+    }
+    defer resp.Body.Close()
+
+    return resp.StatusCode, nil
+
+}