[csharp] Make API response headers dictionary case insensitive (#2998)

* fix(response-headers): Making response headers case insensitive

* fix(response-headers): Making response headers case insensitive

* feat(csharp): Headers case insensitive

* feat(csharp): Making API response's headers case-insensitive

* feat(csharp): Indentation fix

* feat(csharp): Indentation fix

* feat(csharp): Adding generator's documentation

docs/generators/csharp.md

@@ -28,3 +28,4 @@ sidebar_label: csharp
 |netCoreProjectFile|Use the new format (.NET Core) for .NET project files (.csproj).| |false|
 |validatable|Generates self-validatable models.| |true|
 |useCompareNetObjects|Use KellermanSoftware.CompareNetObjects for deep recursive object comparison. WARNING: this option incurs potential performance impact.| |false|
+|caseInsensitiveResponseHeaders|Make API response's headers case-insensitive| |false|

modules/openapi-generator/src/main/java/org/openapitools/codegen/CodegenConstants.java

@@ -232,6 +232,8 @@ public class CodegenConstants {
     public static final String PARCELIZE_MODELS = "parcelizeModels";
     public static final String PARCELIZE_MODELS_DESC = "toggle \"@Parcelize\" for generated models";
 
+    public static final String CASE_INSENSITIVE_RESPONSE_HEADERS = "caseInsensitiveResponseHeaders";
+    public static final String CASE_INSENSITIVE_RESPONSE_HEADERS_DESC = "Make API response's headers case-insensitive";
 
     // Not user-configurable. System provided for use in templates.
 

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CSharpClientCodegen.java

@@ -73,6 +73,9 @@ public class CSharpClientCodegen extends AbstractCSharpCodegen {
     // use KellermanSoftware.CompareNetObjects for deep recursive object comparision
     protected boolean useCompareNetObjects = Boolean.FALSE;
 
+    // To make API response's headers dictionary case insensitive
+    protected boolean caseInsensitiveResponseHeaders = Boolean.FALSE;
+
     public CSharpClientCodegen() {
         super();
         supportsInheritance = true;
@@ -199,6 +202,10 @@ public class CSharpClientCodegen extends AbstractCSharpCodegen {
                 CodegenConstants.USE_COMPARE_NET_OBJECTS_DESC,
                 this.useCompareNetObjects);
 
+        addSwitch(CodegenConstants.CASE_INSENSITIVE_RESPONSE_HEADERS,
+                CodegenConstants.CASE_INSENSITIVE_RESPONSE_HEADERS_DESC,
+                this.caseInsensitiveResponseHeaders);
+
         regexModifiers = new HashMap<Character, String>();
         regexModifiers.put('i', "IgnoreCase");
         regexModifiers.put('m', "Multiline");
@@ -802,6 +809,10 @@ public class CSharpClientCodegen extends AbstractCSharpCodegen {
         this.useCompareNetObjects = useCompareNetObjects;
     }
 
+    public void setCaseInsensitiveResponseHeaders(final Boolean caseInsensitiveResponseHeaders) {
+        this.caseInsensitiveResponseHeaders = caseInsensitiveResponseHeaders;
+    }
+
     public boolean isNonPublicApi() {
         return nonPublicApi;
     }

modules/openapi-generator/src/main/resources/csharp/api.mustache

@@ -308,12 +308,12 @@ namespace {{packageName}}.{{apiPackage}}
 
             {{#returnType}}
             return new ApiResponse<{{{returnType}}}>(localVarStatusCode,
-                localVarResponse.Headers.ToDictionary(x => x.{{^netStandard}}Name{{/netStandard}}{{#netStandard}}Key{{/netStandard}}, x => string.Join(",", x.Value)),
+                localVarResponse.Headers.ToDictionary(x => x.{{^netStandard}}Name{{/netStandard}}{{#netStandard}}Key{{/netStandard}}, x => string.Join(",", x.Value){{#caseInsensitiveResponseHeaders}}, StringComparer.OrdinalIgnoreCase{{/caseInsensitiveResponseHeaders}}),
                 ({{{returnType}}}) this.Configuration.ApiClient.Deserialize(localVarResponse, typeof({{#returnContainer}}{{{returnContainer}}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}})));
             {{/returnType}}
             {{^returnType}}
             return new ApiResponse<Object>(localVarStatusCode,
-                localVarResponse.Headers.ToDictionary(x => x.{{^netStandard}}Name{{/netStandard}}{{#netStandard}}Key{{/netStandard}}, x => string.Join(",", x.Value)),
+                localVarResponse.Headers.ToDictionary(x => x.{{^netStandard}}Name{{/netStandard}}{{#netStandard}}Key{{/netStandard}}, x => string.Join(",", x.Value){{#caseInsensitiveResponseHeaders}}, StringComparer.OrdinalIgnoreCase{{/caseInsensitiveResponseHeaders}}),
                 null);
             {{/returnType}}
         }
@@ -444,12 +444,12 @@ namespace {{packageName}}.{{apiPackage}}
 
             {{#returnType}}
             return new ApiResponse<{{{returnType}}}>(localVarStatusCode,
-                localVarResponse.Headers.ToDictionary(x => x.{{^netStandard}}Name{{/netStandard}}{{#netStandard}}Key{{/netStandard}}, x => string.Join(",", x.Value)),
+                localVarResponse.Headers.ToDictionary(x => x.{{^netStandard}}Name{{/netStandard}}{{#netStandard}}Key{{/netStandard}}, x => string.Join(",", x.Value){{#caseInsensitiveResponseHeaders}}, StringComparer.OrdinalIgnoreCase{{/caseInsensitiveResponseHeaders}}),
                 ({{{returnType}}}) this.Configuration.ApiClient.Deserialize(localVarResponse, typeof({{#returnContainer}}{{{returnContainer}}}{{/returnContainer}}{{^returnContainer}}{{{returnType}}}{{/returnContainer}})));
             {{/returnType}}
             {{^returnType}}
             return new ApiResponse<Object>(localVarStatusCode,
-                localVarResponse.Headers.ToDictionary(x => x.{{^netStandard}}Name{{/netStandard}}{{#netStandard}}Key{{/netStandard}}, x => string.Join(",", x.Value)),
+                localVarResponse.Headers.ToDictionary(x => x.{{^netStandard}}Name{{/netStandard}}{{#netStandard}}Key{{/netStandard}}, x => string.Join(",", x.Value){{#caseInsensitiveResponseHeaders}}, StringComparer.OrdinalIgnoreCase{{/caseInsensitiveResponseHeaders}}),
                 null);
             {{/returnType}}
         }