fixed health path, when url ends with trailing slash (#87)

* fixed health path, when url ends with trailing slash

* added changelog

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## tip
 
 * BUGFIX: fix variable substitution in queries. See [this issue](https://github.com/VictoriaMetrics/victorialogs-datasource/issues/77).
+* BUGFIX: fixed health path for case, when url ends with trailing slash.
 
 ## v0.5.0
 

pkg/plugin/datasource.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"path"
 	"strings"
 	"sync"
 
@@ -144,7 +145,7 @@ func (d *Datasource) query(ctx context.Context, _ backend.PluginContext, query b
 // datasource configuration page which allows users to verify that
 // a datasource is working as expected.
 func (d *Datasource) CheckHealth(ctx context.Context, _ *backend.CheckHealthRequest) (*backend.CheckHealthResult, error) {
-	r, err := http.NewRequestWithContext(ctx, http.MethodGet, fmt.Sprintf("%s%s", d.settings.URL, health), nil)
+	r, err := http.NewRequestWithContext(ctx, http.MethodGet, path.Join(d.settings.URL, health), nil)
 	if err != nil {
 		return newHealthCheckErrorf("could not create request"), nil
 	}