Module sse 

Server-Sent Events (SSE) support

Server-Sent Events (SSE)

Server-Sent Events (SSE) is a simple and efficient mechanism for servers to push real-time updates to clients over HTTP. Unlike WebSockets, which provide full-duplex communication, SSE establishes a one-way channel from server to client using a long-lived HTTP connection.

Rama offers support for SSE both as a client and a server. As such you could even MITM proxy it.

Server IntoResponse support is also supported, including with Keep-Alive support. See https://ramaproxy.org/docs/rama/http/service/web/response/struct.Sse.html for more info.

Learn more about SSE at https://ramaproxy.org/book/sse.html.

Examples

You can find ready-to-run examples demonstrating how to expose and consume SSE endpoints using Rama:

• http_sse.rs Simple example showing how to expose an SSE endpoint with string data.
• http_sse_json.rs Same as above, but emits structured JSON data using typed Rust structs.

These examples make use of Rama’s typed header support, such as LastEventId, which allows easy extraction of reconnect state to resume streams reliably.

Datastar

Datastar helps you build reactive web applications with the simplicity of server-side rendering and the power of a full-stack SPA framework.

— https://data-star.dev/

Rama has built-in support for 🚀 Datastar. You can see it in action in Examples:

• /examples/http_sse_datastar_hello.rs: SSE Example, showcasing a very simple datastar example, which is supported by rama both on the client as well as the server side.

Rama rust docs:

• SSE support: datastar
• Extractor support (ReadSignals): https://ramaproxy.org/docs/rama/http/service/web/extract/datastar/index.html
• Embedded JS Script: https://ramaproxy.org/docs/rama/http/service/web/response/struct.DatastarScript.html

Code Origins

Some code in this repo is adapted from third party sources:

• Axum (see https://github.com/plabayo/rama/blob/main/docs/thirdparty/fork/README.md#relative-forks)
• https://github.com/jpopesculian/eventsource-stream/tree/3d46f1c758f9ee4681e9da0427556d24c53f9c01:
  • Licensed under MIT OR Apache-2.0, owned by Julian Popescu jpopesculian@gmail.com

Modules

datastar

🚀 Datastar support for rama.

server

SSE types for servers.

Structs

Event

Server-sent event

EventBuildError

EventDataJsonReader

EventDataLineReader for the EventDataRead implementation of any json-compatible DeserializeOwned.

EventDataMultiLineReader

EventDataLineReader for the EventDataRead implementation of Vec.

EventDataStringReader

EventDataLineReader for the EventDataRead implementation of String.

EventStream

A Stream of SSE’s used by the client.

JsonEventData

Wrapper used to create Json event data.

Traits

EventDataLineReader

EventDataRead

Trait that can be implemented for a custom data type that is to be read (by a client).

EventDataWrite

Trait that can be implemented for a custom data type that is to be written (by a server).