如何将表单数据发布到ASP.NET WebAPI 2？

Question

I'm having trouble accessing parameters submitted via POST in my ASP.NET WebAPI 2 application. I hav a very trivial controller and an action, which simply captures the parameter and returns 200.

public IHttpActionResult Post([FromBody] string foo)
{
    return Ok();
}

And I'm making the request via cURL

curl http://localhost:24196/api/checkpoints -XPOST -d foo=bar

The parameter ends up being null . The same happens when I try this with jQuery.

$.post("http://localhost:24196/api/checkpoints", { foo: "bar" })

I've found a post that seems to describe this issue , but I'm not sure if that's really the correct way to fix this (using the = encoding).

What is the correct/standard way of talking to a WebAPI service, and how does the parameter binding actually work in these cases?

Answer 1

As documented in the link, FromBody expects data in a certain way =foo - re: there is no "key". So:

Curl:

curl -X POST -d "=bar" http://localhost/controller

Jquery:

var _data = { "": "bar" };

---

Update:

Reference for this behavior: Sending simple types

By default, Web API tries to get simple types from the request URI. The FromBody attribute tells Web API to read the value from the request body.

...If you need to get multiple values from the request body, define a complex type.

Second, the client needs to send the value with the following format:

=value

Hth...