`Gin` now have the `protobufBinding` function to check the request format, but didn't have a protobuf response function like `c.YAML()`.
In our company [ByteDance](http://bytedance.com/), the largest internet company using golang in China, we use `gin` to transfer __Protobuf__ instead of __Json__, we have to write some internal library to make some wrappers to achieve that, and the code is not elegant. So we really want such a feature.
* support query map
* add GetQueryMap and unittest
* support post-form map
* add readme for query map
* attempt to fix bug for post-form map when go version is 1.6
* remove duplicate code
* remove comment
gin already support http2, while previously not support server push.
Add Pusher() function to extend the ResponseWriter interface.
```golang
// get http.Pusher
if pusher := c.Writer.Pusher(); pusher != nil {
// use pusher.Push() to do server push
}
```
<img width="881" alt="screen shot 2018-03-07 at 11 20 49 pm" src="https://user-images.githubusercontent.com/16014993/37100619-680c00c6-225e-11e8-9352-76ec3bd62894.png">
Reference this issue #1323
1. There isn't any eg about `HandleContext`
2. The `c.Request.Path` of `HandleContext` Comment is not right
Based on the above two points, I pull this request.
If you think it's unnecessary, I will close this.
Thx.
* Add interface to read body bytes in binding
* Add BindingBody implementation for some binding
* Fix to use `BindBodyBytesKey` for key
* Revert "Fix to use `BindBodyBytesKey` for key"
This reverts commit 2c82901cea.
* Use private-like key for body bytes
* Add tests for BindingBody & ShouldBindBodyWith
* Add note for README
* Remove redundant space between sentences
* fix(binding): Expose validator engine used by the default Validator
- Add func ValidatorEngine for returning the underlying validator engine used
in the default StructValidator implementation.
- Remove the function RegisterValidation from the StructValidator interface
which made it immpossible to use a StructValidator implementation without the
validator.v8 library.
- Update and rename test for registering validation
Test{RegisterValidation => ValidatorEngine}.
- Update readme and example for registering custom validation.
- Add example for registering struct level validation.
- Add documentation for the following binding funcs/types:
- Binding interface
- StructValidator interface
- Validator instance
- Binding implementations
- Default func
* fix(binding): Move validator engine getter inside interface
* docs: rm date cmd from custom validation demo
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* feat(context): ShouldBind counterparts for Bind methods + tests
* docs(readme): Switch examples to use ShouldBind methods
Add section for bind methods types, explain difference in behavior.
Switch all `c.Bind` examples to use `c.ShouldBind`.
* feat(binding): Add support for custom validation tags
* docs: Add example for custom validation tag
* test(binding): Add test for registering custom validation
田欧
