[Instrumentation.AspNetCore, Instrumentation.Http] Revert support for OTEL_INSTRUMENTATION_HTTP_KNOWN_METHODS

src/OpenTelemetry.Instrumentation.AspNet/Implementation/HttpInListener.cs

@@ -14,7 +14,7 @@ internal sealed class HttpInListener : IDisposable
 {
     private readonly HttpRequestRouteHelper routeHelper = new();
     private readonly AspNetTraceInstrumentationOptions options;
-    private readonly RequestDataHelper requestDataHelper = new();
+    private readonly RequestDataHelper requestDataHelper = new(configureByHttpKnownMethodsEnvironmentalVariable: true);
 
     public HttpInListener(AspNetTraceInstrumentationOptions options)
     {

src/OpenTelemetry.Instrumentation.AspNet/Implementation/HttpInMetricsListener.cs

@@ -13,7 +13,7 @@ namespace OpenTelemetry.Instrumentation.AspNet.Implementation;
 internal sealed class HttpInMetricsListener : IDisposable
 {
     private readonly HttpRequestRouteHelper routeHelper = new();
-    private readonly RequestDataHelper requestDataHelper = new();
+    private readonly RequestDataHelper requestDataHelper = new(configureByHttpKnownMethodsEnvironmentalVariable: true);
     private readonly Histogram<double> httpServerDuration;
     private readonly AspNetMetricsInstrumentationOptions options;
 

src/OpenTelemetry.Instrumentation.AspNetCore/Implementation/TelemetryHelper.cs

@@ -8,7 +8,7 @@ namespace OpenTelemetry.Instrumentation.AspNetCore.Implementation;
 internal static class TelemetryHelper
 {
     public static readonly object[] BoxedStatusCodes = InitializeBoxedStatusCodes();
-    internal static readonly RequestDataHelper RequestDataHelper = new();
+    internal static readonly RequestDataHelper RequestDataHelper = new(configureByHttpKnownMethodsEnvironmentalVariable: false);
 
     public static object GetBoxedStatusCode(int statusCode)
     {

src/OpenTelemetry.Instrumentation.Http/Implementation/HttpTagHelper.cs

@@ -10,7 +10,7 @@ namespace OpenTelemetry.Instrumentation.Http.Implementation;
 /// </summary>
 internal static class HttpTagHelper
 {
-    internal static readonly RequestDataHelper RequestDataHelper = new();
+    internal static readonly RequestDataHelper RequestDataHelper = new(configureByHttpKnownMethodsEnvironmentalVariable: false);
 
     /// <summary>
     /// Gets the OpenTelemetry standard uri tag value for a span based on its request <see cref="Uri"/>.

src/Shared/RequestDataHelper.cs

@@ -33,10 +33,10 @@ internal sealed class RequestDataHelper
     private readonly Dictionary<string, string> knownHttpMethods;
 #endif
 
-    public RequestDataHelper()
+    public RequestDataHelper(bool configureByHttpKnownMethodsEnvironmentalVariable)
     {
-        var suppliedKnownMethods = Environment.GetEnvironmentVariable(KnownHttpMethodsEnvironmentVariable)
-            ?.Split(SplitChars, StringSplitOptions.RemoveEmptyEntries);
+        var suppliedKnownMethods = configureByHttpKnownMethodsEnvironmentalVariable ? Environment.GetEnvironmentVariable(KnownHttpMethodsEnvironmentVariable)
+            ?.Split(SplitChars, StringSplitOptions.RemoveEmptyEntries) : null;
         var knownMethodSet = suppliedKnownMethods?.Length > 0
             ? suppliedKnownMethods.ToDictionary(x => x, x => x, StringComparer.OrdinalIgnoreCase)
             : new(StringComparer.OrdinalIgnoreCase)

test/OpenTelemetry.Instrumentation.AspNet.Tests/RequestDataHelperTests.cs

@@ -34,7 +34,7 @@ public class RequestDataHelperTests : IDisposable
     [InlineData("invalid", "_OTHER")]
     public void MethodMappingWorksForKnownMethods(string method, string expected)
     {
-        var requestHelper = new RequestDataHelper();
+        var requestHelper = new RequestDataHelper(configureByHttpKnownMethodsEnvironmentalVariable: true);
         var actual = requestHelper.GetNormalizedHttpMethod(method);
         Assert.Equal(expected, actual);
     }
@@ -55,11 +55,20 @@ public void MethodMappingWorksForKnownMethods(string method, string expected)
     public void MethodMappingWorksForEnvironmentVariables(string method, string expected)
     {
         Environment.SetEnvironmentVariable("OTEL_INSTRUMENTATION_HTTP_KNOWN_METHODS", "GET,POST");
-        var requestHelper = new RequestDataHelper();
+        var requestHelper = new RequestDataHelper(configureByHttpKnownMethodsEnvironmentalVariable: true);
         var actual = requestHelper.GetNormalizedHttpMethod(method);
         Assert.Equal(expected, actual);
     }
 
+    [Fact]
+    public void MethodMappingWorksIfEnvironmentalVariableConfigurationIsDisabled()
+    {
+        Environment.SetEnvironmentVariable("OTEL_INSTRUMENTATION_HTTP_KNOWN_METHODS", "GET,POST");
+        var requestHelper = new RequestDataHelper(configureByHttpKnownMethodsEnvironmentalVariable: false);
+        var actual = requestHelper.GetNormalizedHttpMethod("CONNECT");
+        Assert.Equal("CONNECT", actual);
+    }
+
     [Theory]
     [InlineData("HTTP/1.1", "1.1")]
     [InlineData("HTTP/2", "2")]