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Showing posts from November, 2024

ASP.NET Core Pitfalls – Posting a String

This is another post on my ASP.NET Core pitfalls series . It is actually related to this one  ASP.NET Core Pitfalls – Null Models in Post Requests . What happens if you try to submit a string containing JSON as a POST? I mean, you always submit strings, but this time you don't want for it to be parsed into some class. Like this: [HttpPost] public IActionResult PostString([FromBody] string json) { ... } You may be surprised to find out that this fails with a HTTP 415 Unsupported Media Type . Now, you might be tempted to add an [Consumes] attribute to it, such as: [HttpPost] [Consumes("application/json")] public IActionResult PostString([FromBody] string json) { ... } And this will actually work! The problem is, or could be, that it requires the sender to send the appropriate Content-Type header (" application/json "). Another, better, solution is to just read the string from the from the request stream: [HttpPost] public IActionResult PostString() { using v