fetch library Null safety

Fetch Standard

https://fetch.spec.whatwg.org/

Classes

Body
Headers
The interface of the Fetch API allows you to perform various actions on HTTP request and response headers. These actions include retrieving, setting, adding to, and removing headers from the list of the request's headers. A object has an associated header list, which is initially empty and consists of zero or more name and value pairs. You can add to this using methods like append() (see Examples.) In all methods of this interface, header names are matched by case-insensitive byte sequence. For security reasons, some headers can only be controlled by the user agent. These headers include the forbidden header names and forbidden response header names. A Headers object also has an associated guard, which takes a value of immutable, request, request-no-cors, response, or none. This affects whether the set(), delete(), and append() methods will mutate the header. For more information see Guard. You can retrieve a object via the Request.headers and Response.headers properties, and create a new object using the Headers.Headers() constructor. An object implementing can directly be used in a for...of structure, instead of entries(): for (var p of myHeaders) is equivalent to for (var p of myHeaders.entries()).
Request
The interface of the Fetch API represents a resource request. You can create a new object using the Request() constructor, but you are more likely to encounter a object being returned as the result of another API operation, such as a service worker FetchEvent.request.
RequestInit
Response
The interface of the Fetch API represents the response to a request. You can create a new object using the Response.Response() constructor, but you are more likely to encounter a object being returned as the result of another API operation—for example, a service worker FetchEvent.respondWith, or a simple fetch().
ResponseInit

Extensions

PropsBody
PropsHeaders
PropsRequest
PropsRequestInit
PropsResponse
PropsResponseInit

Enums

RequestCache
RequestCredentials
RequestDestination
RequestDuplex
RequestMode
RequestRedirect
ResponseType