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The service only occasionally throws a header error "Access Error-Control-Allow-Origin"

I have a service with several methods. I installed my Global.asax file to handle CORS, and everything that worked fine included CORS ... This is until I added the following to the interface file:

[OperationContract]
[WebInvoke(UriTemplate = "/Transform", Method = "POST", ResponseFormat = WebMessageFormat.Json)]
bool XXXTransform(string user, string x);

and the next class of service ...

bool XXXTransform(string user, string x)
{
    return true;
}

Now, this is a really interesting thing. An error occurs when I call a method GetRecipes. Even more interesting is that if I have only one parameter specified XXXTransformfor the interface and class of service, it does not throw an error - as inbool XXXTransform(string user)

Has anyone ever seen something like this before? Why does using one parameter work, but do two parameters cause an origin error when calling a completely different method?

IChomp.cs:

namespace NomNomNotebookService
{
    // May need to mod service behavior for upload...
    [ServiceContract]
    public interface IChomp
    {
        [OperationContract]
        [WebInvoke(UriTemplate = "/{userId}/Recipes", Method = "GET", ResponseFormat = WebMessageFormat.Json)]
        List<Recipe> GetRecipes(string userId);

        [OperationContract]
        [WebInvoke(UriTemplate = "/{userId}/Recipes", Method = "POST", BodyStyle = WebMessageBodyStyle.WrappedRequest, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
        Recipe AddRecipe(string userId, Recipe recipe);

        [OperationContract]
        [WebInvoke(UriTemplate = "/{userId}/Recipes/{recipeId}", Method = "POST", BodyStyle = WebMessageBodyStyle.WrappedRequest, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
        Recipe UpdateRecipe(string userId, string recipeId, Recipe recipe);

        [OperationContract]
        [WebInvoke(UriTemplate = "/{userId}/Recipes/{recipeId}", Method = "DELETE", BodyStyle = WebMessageBodyStyle.WrappedRequest, ResponseFormat = WebMessageFormat.Json)]
        bool DeleteRecipe(string userId, string recipeId);

        [OperationContract]
        [WebInvoke(UriTemplate = "/{userId}/Recipes/{recipeId}", Method = "GET", ResponseFormat = WebMessageFormat.Json)]
        Recipe GetRecipe(string userId, string recipeId);

        [OperationContract]
        [WebInvoke(UriTemplate = "/Categories", Method = "GET", ResponseFormat = WebMessageFormat.Json)]
        List<Category> GetCategories();

        [OperationContract]
        [WebInvoke(UriTemplate = "/Upload", Method = "POST", ResponseFormat = WebMessageFormat.Json)]
        bool XXXUpload();

        [OperationContract]
        [WebInvoke(UriTemplate = "/Transform", Method = "POST", ResponseFormat = WebMessageFormat.Json)]
        bool XXXTransform(string user, string x); // WILL work if I have bool XXXTransform(string user)
    }
}

Chomp.cs

namespace NomNomNotebookService
{
    public class Chomp : IChomp
    {
        private DBConnector _dbCon = new DBConnector();

        public List<Recipe> GetRecipes(string userId)
        {
            _dbCon.Parameters.Add(new CustSqlParam("@userId", Int16.Parse(userId)));
            DataTable dt = _dbCon.RunProc("J_NNN_GetRecipesForUser");

            List<Recipe> recipes = new List<Recipe>();
            foreach (DataRow row in dt.Rows)
            {
                recipes.Add(new Recipe((int)row["Uid"], (string)row["Name"], (string)row["Description"], (string)row["Category"]));
            }

            _dbCon.Kill();

            return recipes;
        }

        public Recipe GetRecipe(string userId, string recipeId)
        {
            _dbCon.Parameters.Add(new CustSqlParam("@uid", Int16.Parse(recipeId)));
            DataTable dt = _dbCon.RunProc("J_NNN_GetRecipe");

            Recipe recipe = new Recipe(dt.Rows[0]);
            _dbCon.Kill();

            return recipe;
        }

        // USER ID IS HERE FOR VALIDATION ONCE SESSIONS ARE ROLLING
        public Recipe AddRecipe(string userId, Recipe recipe)
        {
            _dbCon.Parameters.Add(new CustSqlParam("@userId", Int16.Parse(userId)));
            _dbCon.Parameters.Add(new CustSqlParam("@name", recipe.Name));
            _dbCon.Parameters.Add(new CustSqlParam("@description", recipe.Description));
            _dbCon.Parameters.Add(new CustSqlParam("@categoryId", recipe.Category.Uid));
            _dbCon.Parameters.Add(new CustSqlParam("@prepTime", recipe.PrepTime));
            _dbCon.Parameters.Add(new CustSqlParam("@cookTime", recipe.CookTime));
            _dbCon.Parameters.Add(new CustSqlParam("@readyTime", recipe.ReadyTime));

            DataTable dt = _dbCon.RunProc("J_NNN_AddRecipe");
            _dbCon.Kill();
            return new Recipe(dt.Rows[0]);
        }

        public Recipe UpdateRecipe(string userId, string recipeId, Recipe recipe)
        {
            _dbCon.Parameters.Add(new CustSqlParam("@uid", Int16.Parse(recipeId)));
            _dbCon.Parameters.Add(new CustSqlParam("@name", recipe.Name));
            _dbCon.Parameters.Add(new CustSqlParam("@description", recipe.Description));
            _dbCon.Parameters.Add(new CustSqlParam("@categoryId", recipe.Category.Uid));
            _dbCon.Parameters.Add(new CustSqlParam("@prepTime", recipe.PrepTime));
            _dbCon.Parameters.Add(new CustSqlParam("@cookTime", recipe.CookTime));
            _dbCon.Parameters.Add(new CustSqlParam("@readyTime", recipe.ReadyTime));

            DataTable dt = _dbCon.RunProc("J_NNN_UpdateRecipe");
            _dbCon.Kill();
            return new Recipe(dt.Rows[0]);
        }

        public bool DeleteRecipe(string userId, string recipeId)
        {
            try
            {
                _dbCon.Parameters.Add(new CustSqlParam("@uid", Int16.Parse(recipeId)));
                DataTable dt = _dbCon.RunProc("J_NNN_DeleteRecipe");
                _dbCon.Kill();
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
                return false;
            }
            return true;
        }

        public List<Category> GetCategories()
        {
            DataTable dt = _dbCon.RunProc("J_NNN_GetCategories");
            _dbCon.Kill();

            List<Category> categories = new List<Category>();
            foreach (DataRow row in dt.Rows)
            {
                categories.Add(new Category((int)row["Uid"], (string)row["Name"]));
            }

            return categories;
        }

        // Upload shit....
        public bool XXXUpload()
        {
            return false;
        }

        public bool XXXTransform(string user, string x) // WILL work if I have bool XXXTransform(string user)
        {

            return true;
        }
    }
}

Global.asax

namespace NomNomNotebookService
{
    public class Global : System.Web.HttpApplication
    {
        protected void Session_Start(object sender, EventArgs e)
        {
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "*");
            if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
            {
                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");
                HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
                HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000");
                HttpContext.Current.Response.End();
            }
        }
    }
}
+4
1

. ?

'Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE,OPTIONS'
'Access-Control-Allow-Headers', 'Content-Type, Authorization, Content-Length, X-Requested-With'
+1

Source: https://habr.com/ru/post/1568844/

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