Fix compare MapPath

Author: phnx47

src/Prometheus.Client.MetricServer/MetricServer.HttpListener.cs

@@ -89,7 +89,7 @@ public MetricServer(string host, int port, string mapPath, ICollectorRegistry re
             if (!mapPath.StartsWith("/"))
                 throw new ArgumentException($"mapPath '{mapPath}' should start with '/'");
 
-            _mapPath = mapPath.TrimEnd('/');
+            _mapPath = mapPath.EndsWith("/") ? mapPath : mapPath + "/";
             _httpListener.Prefixes.Add($"http{(useHttps ? "s" : "")}://{host}:{port}/");
         }
 
@@ -131,7 +131,9 @@ private void StartListen()
                     var request = context.Request;
                     var response = context.Response;
 
-                    if (request.RawUrl.TrimEnd('/') == _mapPath)
+                    var rawUrl = request.RawUrl.EndsWith("/") ? request.RawUrl : request.RawUrl + "/";
+                    
+                    if (rawUrl == _mapPath)
                     {
                         response.StatusCode = 200;
                         response.ContentType = Defaults.ContentType;

src/Prometheus.Client.MetricServer/Prometheus.Client.MetricServer.csproj

@@ -3,7 +3,7 @@
     <Description>MetricServer for the Prometheus.Client</Description>
     <Copyright>2018 © Sergey Kuznetsov</Copyright>
     <AssemblyTitle>Prometheus.Client.MetricServer</AssemblyTitle>
-    <VersionPrefix>2.0.1</VersionPrefix>
+    <VersionPrefix>2.0.2</VersionPrefix>
     <Authors>Sergey Kuznetsov</Authors>
     <TargetFrameworks Condition=" '$(OS)' != 'Windows_NT' ">netstandard1.3;netstandard2.0</TargetFrameworks>
     <TargetFrameworks Condition=" '$(OS)' == 'Windows_NT' ">net45;netstandard1.3;netstandard2.0</TargetFrameworks>