feat: add new fetch bindings to the rust kit (#171)

* feat: add new fetch bindings to the rust kit

* docs: pin the Rust examples to the latest version branch

* feat: allow passing a Vec<u8> as body when making requests from a worker

* docs: add a clarification about how rust-fetch example is retrieving the data

Cargo.toml

@@ -60,6 +60,7 @@ members = [
 exclude = [
   "examples/pdf-create",
   "examples/rust-basic",
+  "examples/rust-fetch",
   "examples/rust-kv",
   "examples/rust-params"
 ]

docs/docs/languages/rust.md

@@ -29,7 +29,7 @@ In this example, the worker will get a request and print all the related informa
 
     [dependencies]
     anyhow = "1.0.63"
-    wasm-workers-rs = { git = "https://github.com/vmware-labs/wasm-workers-server/" }
+    wasm-workers-rs = { git = "https://github.com/vmware-labs/wasm-workers-server/", branch = "v1.3" }
     ```
 
 1. Add the `reply` function to the `src/main.rs` file. You will need to import the required resources from the `wasm-workers-rs` crate and use the `worker` macro:
@@ -136,7 +136,7 @@ To add a KV store to your worker, follow these steps:
 
     [dependencies]
     anyhow = "1.0.63"
-    wasm-workers-rs = { git = "https://github.com/vmware-labs/wasm-workers-server/" }
+    wasm-workers-rs = { git = "https://github.com/vmware-labs/wasm-workers-server/", branch = "v1.3" }
     ```
 
 1. Add the `reply` function to the `src/main.rs` file. You will need to import the required resources from the `wasm-workers-rs` crate and use the `worker` macro. In this case, we will add a new attribute to the `worker` macro called `cache` and update the function signature:
@@ -317,4 +317,4 @@ If you prefer, you can configure the environment variable value dynamically by f
 ## Other examples
 
 * [Basic](https://github.com/vmware-labs/wasm-workers-server/tree/main/examples/rust-basic)
-* [Counter](https://github.com/vmware-labs/wasm-workers-server/tree/main/examples/rust-kv)
+* [Counter](https://github.com/vmware-labs/wasm-workers-server/tree/main/examples/rust-kv)

examples/Makefile

@@ -5,6 +5,11 @@ rust-basic:
 	cargo build --target wasm32-wasi --release && \
 	cp target/wasm32-wasi/release/rust-basic.wasm ./basic.wasm
 
+rust-fetch:
+	cd rust-fetch && \
+	cargo build --target wasm32-wasi --release && \
+	cp target/wasm32-wasi/release/rust-fetch.wasm ./index.wasm
+
 rust-kv:
 	cd rust-kv && \
 	cargo build --target wasm32-wasi --release && \
@@ -20,4 +25,4 @@ rust-pdf-create:
 	cargo build --target wasm32-wasi --release && \
 	mv target/wasm32-wasi/release/rust-pdf-create.wasm ./index.wasm
 
-all: rust-basic rust-kv rust-params
+all: rust-basic rust-fetch rust-kv rust-params