high-level body methods on dart:io's HttpRequest

[DartBot]

This issue was originally filed by [email protected]

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It would be convenient to have high-level methods on HttpRequest for accessing the request body. For example Future<String> textBody() and Future<List<int>> binaryBody() This would save server-side Dart developers from rewriting the same InputStream code repeatedly. Third parties could do this in a library, but it seems more natural as a method on the request.

[sgjesse]

Added Area-IO, Triaged labels.

[sgjesse]

The same level of access to the body fits the HttpClientResponse.

When designing a convenient way of getting access to the whole body without using the streaming interface there need to be some way of handling large bodies. Either some kind of limit and failing the request or the future completing with an object where some of the body data is available and the rest still needs to be received using streaming.

[sgjesse]

Added Duplicate label.
Marked as being merged into #8834.

[kevmoo]

Removed Area-IO label.
Added Area-Library, Library-IO labels.