http-get

ASP.NET Core – Four basic ways to receive parameters

by

There are four basic ways to receive parameters in an ASP.NET Core Web API: query strings, path parameters, request body, and request headers. I’ll show examples of these below. Query string parameters Let’s say you have two query string keys: name and servings. To get these query string values, add method parameters with names that … Read more

ASP.NET Core – How to get request headers

by

There are two ways to get request headers: When a request comes in, the framework loads request headers into the Request.Headers dictionary. You can use this just like any other dictionary. Here’s an example of using TryGetValue() to check if a request header exists and get its value: Note: To just check if a header … Read more

ASP.NET Core – The request matched multiple endpoints

by

Problem When you send a request to an endpoint, you get the following error response: Note: If you’re using Swagger, you may see this in the UI as a generic error: “Failed to load API definition … response status is 500.” If you look in the ASP.NET Core Web Server output in Visual Studio, you … Read more

Postman – Follow redirects with the original HTTP method

by

When you send a request with Postman and get a 301/302 redirect response, it follows the redirect with a forced GET. This means it sends a GET request to the redirect URL and doesn’t include the original HTTP method or Content-Type. This can result in two unexpected errors: Here’s what this looks like in Postman … Read more

ASP.NET Core – Getting query string values

by

The ASP.NET Core framework automatically parses query strings (i.e. ?name=Dune&year=2021) into HttpContext.Request.Query and maps the query string values to parameters in the action method (if you’ve added them). You can get the mapped query string values by adding action parameters, like this: Or you can use HttpContext.Request.Query directly (which is useful in many scenarios): This … Read more

Add a custom action filter in ASP.NET Core

by

Action filters allow you to look at requests right before they are routed to an action method (and responses right after they are returned from the action method). The simplest way to add your own action filter in ASP.NET Core is to subclass ActionFilterAttribute and then override the appropriate methods depending on if you want … Read more