mirror of
https://github.com/actix/actix-website
synced 2024-11-24 00:41:07 +01:00
91 lines
3.6 KiB
Markdown
91 lines
3.6 KiB
Markdown
---
|
|
title: Requests
|
|
---
|
|
|
|
import CodeBlock from "@site/src/components/code_block";
|
|
|
|
# JSON Request
|
|
|
|
There are several options for json body deserialization.
|
|
|
|
The first option is to use _Json_ extractor. First, you define a handler function that accepts `Json<T>` as a parameter, then, you use the `.to()` method for registering this handler. It is also possible to accept arbitrary valid json object by using `serde_json::Value` as a type `T`.
|
|
|
|
First example of `JSON Request` depends on `serde`:
|
|
|
|
```toml
|
|
[dependencies]
|
|
serde = { version = "1.0", features = ["derive"] }
|
|
```
|
|
|
|
Second example of `JSON Request` depends on `serde` and `serde_json` and `futures`:
|
|
|
|
```toml
|
|
[dependencies]
|
|
serde = { version = "1.0", features = ["derive"] }
|
|
serde_json = "1"
|
|
futures = "0.3"
|
|
```
|
|
|
|
If you want to add default value for a field, refer to `serde`'s [documentation](https://serde.rs/attr-default.html).
|
|
|
|
<CodeBlock example="requests" file="main.rs" section="json-request" />
|
|
|
|
You may also manually load the payload into memory and then deserialize it.
|
|
|
|
In the following example, we will deserialize a _MyObj_ struct. We need to load the request body first and then deserialize the json into an object.
|
|
|
|
<CodeBlock example="requests" file="manual.rs" section="json-manual" />
|
|
|
|
> A complete example for both options is available in [examples directory][examples].
|
|
|
|
## Content Encoding
|
|
|
|
Actix Web automatically _decompresses_ payloads. The following codecs are supported:
|
|
|
|
- Brotli
|
|
- Gzip
|
|
- Deflate
|
|
- Zstd
|
|
|
|
If request headers contain a `Content-Encoding` header, the request payload is decompressed according to the header value. Multiple codecs are not supported, i.e: `Content-Encoding: br, gzip`.
|
|
|
|
## Chunked transfer encoding
|
|
|
|
Actix automatically decodes _chunked_ encoding. The [`web::Payload`][payloadextractor] extractor already contains the decoded byte stream. If the request payload is compressed with one of the supported compression codecs (br, gzip, deflate), then the byte stream is decompressed.
|
|
|
|
## Multipart body
|
|
|
|
Actix Web provides multipart stream support with an external crate, [`actix-multipart`][multipartcrate].
|
|
|
|
> A full example is available in the [examples directory][multipartexample].
|
|
|
|
## Urlencoded body
|
|
|
|
Actix Web provides support for _application/x-www-form-urlencoded_ encoded bodies with the [`web::Form`][formencoded] extractor which resolves to the deserialized instance. The type of the instance must implement the `Deserialize` trait from _serde_.
|
|
|
|
The _UrlEncoded_ future can resolve into an error in several cases:
|
|
|
|
- content type is not `application/x-www-form-urlencoded`
|
|
- transfer encoding is `chunked`.
|
|
- content-length is greater than 256k
|
|
- payload terminates with error.
|
|
|
|
<CodeBlock example="requests" file="urlencoded.rs" section="urlencoded" />
|
|
|
|
## Streaming request
|
|
|
|
_HttpRequest_ is a stream of `Bytes` objects. It can be used to read the request body payload.
|
|
|
|
In the following example, we read and print the request payload chunk by chunk:
|
|
|
|
<CodeBlock example="requests" file="streaming.rs" section="streaming" />
|
|
|
|
[examples]: https://github.com/actix/examples/tree/master/json/json
|
|
[multipartstruct]: https://docs.rs/actix-multipart/0.2/actix_multipart/struct.Multipart.html
|
|
[fieldstruct]: https://docs.rs/actix-multipart/0.2/actix_multipart/struct.Field.html
|
|
[multipartexample]: https://github.com/actix/examples/tree/master/forms/multipart
|
|
[urlencoded]: https://docs.rs/actix-web/4/actix_web/dev/struct.UrlEncoded.html
|
|
[payloadextractor]: https://docs.rs/actix-web/4/actix_web/web/struct.Payload.html
|
|
[multipartcrate]: https://crates.io/crates/actix-multipart
|
|
[formencoded]: https://docs.rs/actix-web/4/actix_web/web/struct.Form.html
|