diff --git a/modules/openapi-generator/src/main/resources/go-server/controller-api.mustache b/modules/openapi-generator/src/main/resources/go-server/controller-api.mustache
index 70ba7d9983c9..2ebd85e56fd0 100644
--- a/modules/openapi-generator/src/main/resources/go-server/controller-api.mustache
+++ b/modules/openapi-generator/src/main/resources/go-server/controller-api.mustache
@@ -495,7 +495,12 @@ func (c *{{classname}}Controller) {{nickname}}(w http.ResponseWriter, r *http.Re
 	{{/isArray}}{{/isInteger}}
 	{{^isFile}}
 	{{^isLong}}
+	{{#isArray}}
+	{{paramName}}Param := strings.Split(r.FormValue("{{baseName}}"), ",")
+	{{/isArray}}
+	{{^isArray}}
 	{{paramName}}Param := r.FormValue("{{baseName}}")
+	{{/isArray}}
 	{{/isLong}}
 	{{/isFile}}
 	{{/isFormParam}}
diff --git a/modules/openapi-generator/src/test/resources/3_0/go-server/petstore.yaml b/modules/openapi-generator/src/test/resources/3_0/go-server/petstore.yaml
index 9c440c06a0e2..8756d176f8c1 100644
--- a/modules/openapi-generator/src/test/resources/3_0/go-server/petstore.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/go-server/petstore.yaml
@@ -346,6 +346,11 @@ paths:
                 additionalMetadata:
                   description: Additional data to pass to server
                   type: string
+                extraOptionalMetadata:
+                  description: More data to pass to server
+                  type: array
+                  items:
+                    type: string
                 file:
                   description: file to upload
                   type: string
diff --git a/samples/server/petstore/go-api-server/api/openapi.yaml b/samples/server/petstore/go-api-server/api/openapi.yaml
index d1f9d6162065..ee7a4f70c132 100644
--- a/samples/server/petstore/go-api-server/api/openapi.yaml
+++ b/samples/server/petstore/go-api-server/api/openapi.yaml
@@ -1194,6 +1194,11 @@ components:
         additionalMetadata:
           description: Additional data to pass to server
           type: string
+        extraOptionalMetadata:
+          description: More data to pass to server
+          items:
+            type: string
+          type: array
         file:
           description: file to upload
           format: binary
diff --git a/samples/server/petstore/go-api-server/go/api.go b/samples/server/petstore/go-api-server/go/api.go
index 5f7841c33a7d..7af3533d1b80 100644
--- a/samples/server/petstore/go-api-server/go/api.go
+++ b/samples/server/petstore/go-api-server/go/api.go
@@ -76,7 +76,7 @@ type PetAPIServicer interface {
 	GetPetsUsingBooleanQueryParameters(context.Context, bool, bool, bool) (ImplResponse, error)
 	UpdatePet(context.Context, Pet) (ImplResponse, error)
 	UpdatePetWithForm(context.Context, int64, string, string) (ImplResponse, error)
-	UploadFile(context.Context, int64, string, *os.File) (ImplResponse, error)
+	UploadFile(context.Context, int64, string, []string, *os.File) (ImplResponse, error)
 	UploadFileArrayOfFiles(context.Context, int64, string, []*os.File) (ImplResponse, error)
 }
 
diff --git a/samples/server/petstore/go-api-server/go/api_pet.go b/samples/server/petstore/go-api-server/go/api_pet.go
index 7a86c2e82b0e..c40f9c8fa927 100644
--- a/samples/server/petstore/go-api-server/go/api_pet.go
+++ b/samples/server/petstore/go-api-server/go/api_pet.go
@@ -407,6 +407,9 @@ func (c *PetAPIController) UploadFile(w http.ResponseWriter, r *http.Request) {
 	
 	
 	additionalMetadataParam := r.FormValue("additionalMetadata")
+	
+	
+	extraOptionalMetadataParam := strings.Split(r.FormValue("extraOptionalMetadata"), ",")
 	fileParam, err := ReadFormFileToTempFile(r, "file")
 	if err != nil {
 		c.errorHandler(w, r, &ParsingError{Err: err}, nil)
@@ -414,7 +417,7 @@ func (c *PetAPIController) UploadFile(w http.ResponseWriter, r *http.Request) {
 	}
 	
 	
-	result, err := c.service.UploadFile(r.Context(), petIdParam, additionalMetadataParam, fileParam)
+	result, err := c.service.UploadFile(r.Context(), petIdParam, additionalMetadataParam, extraOptionalMetadataParam, fileParam)
 	// If an error occurred, encode the error with the status code
 	if err != nil {
 		c.errorHandler(w, r, err, &result)
diff --git a/samples/server/petstore/go-api-server/go/api_pet_service.go b/samples/server/petstore/go-api-server/go/api_pet_service.go
index 35f250870f7f..c8cb1a207160 100644
--- a/samples/server/petstore/go-api-server/go/api_pet_service.go
+++ b/samples/server/petstore/go-api-server/go/api_pet_service.go
@@ -173,7 +173,7 @@ func (s *PetAPIService) UpdatePetWithForm(ctx context.Context, petId int64, name
 }
 
 // UploadFile - uploads an image
-func (s *PetAPIService) UploadFile(ctx context.Context, petId int64, additionalMetadata string, file *os.File) (ImplResponse, error) {
+func (s *PetAPIService) UploadFile(ctx context.Context, petId int64, additionalMetadata string, extraOptionalMetadata []string, file *os.File) (ImplResponse, error) {
 	// TODO - update UploadFile with the required logic for this service method.
 	// Add api_pet_service.go to the .openapi-generator-ignore to avoid overwriting this service implementation when updating open api generation.
 
diff --git a/samples/server/petstore/go-chi-server/api/openapi.yaml b/samples/server/petstore/go-chi-server/api/openapi.yaml
index d1f9d6162065..ee7a4f70c132 100644
--- a/samples/server/petstore/go-chi-server/api/openapi.yaml
+++ b/samples/server/petstore/go-chi-server/api/openapi.yaml
@@ -1194,6 +1194,11 @@ components:
         additionalMetadata:
           description: Additional data to pass to server
           type: string
+        extraOptionalMetadata:
+          description: More data to pass to server
+          items:
+            type: string
+          type: array
         file:
           description: file to upload
           format: binary
diff --git a/samples/server/petstore/go-chi-server/go/api.go b/samples/server/petstore/go-chi-server/go/api.go
index 5f7841c33a7d..7af3533d1b80 100644
--- a/samples/server/petstore/go-chi-server/go/api.go
+++ b/samples/server/petstore/go-chi-server/go/api.go
@@ -76,7 +76,7 @@ type PetAPIServicer interface {
 	GetPetsUsingBooleanQueryParameters(context.Context, bool, bool, bool) (ImplResponse, error)
 	UpdatePet(context.Context, Pet) (ImplResponse, error)
 	UpdatePetWithForm(context.Context, int64, string, string) (ImplResponse, error)
-	UploadFile(context.Context, int64, string, *os.File) (ImplResponse, error)
+	UploadFile(context.Context, int64, string, []string, *os.File) (ImplResponse, error)
 	UploadFileArrayOfFiles(context.Context, int64, string, []*os.File) (ImplResponse, error)
 }
 
diff --git a/samples/server/petstore/go-chi-server/go/api_pet.go b/samples/server/petstore/go-chi-server/go/api_pet.go
index ddf324752be9..4b22302e1ed7 100644
--- a/samples/server/petstore/go-chi-server/go/api_pet.go
+++ b/samples/server/petstore/go-chi-server/go/api_pet.go
@@ -401,6 +401,9 @@ func (c *PetAPIController) UploadFile(w http.ResponseWriter, r *http.Request) {
 	
 	
 	additionalMetadataParam := r.FormValue("additionalMetadata")
+	
+	
+	extraOptionalMetadataParam := strings.Split(r.FormValue("extraOptionalMetadata"), ",")
 	fileParam, err := ReadFormFileToTempFile(r, "file")
 	if err != nil {
 		c.errorHandler(w, r, &ParsingError{Err: err}, nil)
@@ -408,7 +411,7 @@ func (c *PetAPIController) UploadFile(w http.ResponseWriter, r *http.Request) {
 	}
 	
 	
-	result, err := c.service.UploadFile(r.Context(), petIdParam, additionalMetadataParam, fileParam)
+	result, err := c.service.UploadFile(r.Context(), petIdParam, additionalMetadataParam, extraOptionalMetadataParam, fileParam)
 	// If an error occurred, encode the error with the status code
 	if err != nil {
 		c.errorHandler(w, r, err, &result)
diff --git a/samples/server/petstore/go-chi-server/go/api_pet_service.go b/samples/server/petstore/go-chi-server/go/api_pet_service.go
index 35f250870f7f..c8cb1a207160 100644
--- a/samples/server/petstore/go-chi-server/go/api_pet_service.go
+++ b/samples/server/petstore/go-chi-server/go/api_pet_service.go
@@ -173,7 +173,7 @@ func (s *PetAPIService) UpdatePetWithForm(ctx context.Context, petId int64, name
 }
 
 // UploadFile - uploads an image
-func (s *PetAPIService) UploadFile(ctx context.Context, petId int64, additionalMetadata string, file *os.File) (ImplResponse, error) {
+func (s *PetAPIService) UploadFile(ctx context.Context, petId int64, additionalMetadata string, extraOptionalMetadata []string, file *os.File) (ImplResponse, error) {
 	// TODO - update UploadFile with the required logic for this service method.
 	// Add api_pet_service.go to the .openapi-generator-ignore to avoid overwriting this service implementation when updating open api generation.