Change MVC Web API to support Android, iOS, Ajax and other ways to call across domains

Company A mobile back end of the project used to

Webapi

Project construction to the extranet environment a common app developer has encountered a problem invoking the test interface

interface does not allow cross-domain calls

。 Access to the information understand

Origin policy principle based on request header value

Origin

With the response header value

Access-control-allow-origin

To determine whether the call is allowed

Workaround

1.ajax using jsonp

JSONP is to add the callback function parameter value through the request parameter. Webapi receive callback function parameter value return data is no longer purely JSON, but is based on the callback function parameter value

JS method call, so that the same origin policy is avoided

You need to Webapi rewrite the JSON serialization method.

Jsonmediatypeformatter

2. For terminals such as iOS,

Simple method to configure HTTP headers for IIS directly

This method is simple, fast and unsafe.
Exposed all the
3. Override the Web API's

Delegatinghandler
Adding a custom HTTP header
4. Leveraging the Web API's own extensions
Microsoft ASP. NET Web API 2 Cross-origin support

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