first functionable

src-tauri/.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+/target/
+
+# Generated by Tauri
+# will have schema files for capabilities auto-completion
+/gen/schemas

src-tauri/Cargo.toml

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+[package]
+name = "rest-client"
+version = "0.1.0"
+description = "A Tauri App"
+authors = ["you"]
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+# The `_lib` suffix may seem redundant but it is necessary
+# to make the lib name unique and wouldn't conflict with the bin name.
+# This seems to be only an issue on Windows, see https://github.com/rust-lang/cargo/issues/8519
+name = "rest_client_lib"
+crate-type = ["staticlib", "cdylib", "rlib"]
+
+[build-dependencies]
+tauri-build = { version = "2", features = [] }
+
+[dependencies]
+tauri = { version = "2", features = [] }
+tauri-plugin-opener = "2"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+reqwest = { version = "0.12", features = ["json", "multipart"] }
+tokio = { version = "1", features = ["full"] }
+

src-tauri/build.rs

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+fn main() {
+    tauri_build::build()
+}

src-tauri/capabilities/default.json

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+{
+  "$schema": "../gen/schemas/desktop-schema.json",
+  "identifier": "default",
+  "description": "Capability for the main window",
+  "windows": ["main"],
+  "permissions": [
+    "core:default",
+    "opener:default"
+  ]
+}

src-tauri/src/lib.rs

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+use std::collections::HashMap;
+use std::time::Instant;
+use serde::{Serialize, Deserialize};
+
+#[derive(Serialize, Deserialize)]
+struct HttpResponse {
+    status: u16,
+    headers: HashMap<String, String>,
+    body: String,
+    time_elapsed: u128, // milliseconds
+}
+
+// Learn more about Tauri commands at https://tauri.app/develop/calling-rust/
+#[tauri::command]
+fn greet(name: &str) -> String {
+    format!("Hello, {}! You've been greeted from Rust!", name)
+}
+
+#[tauri::command]
+async fn execute_request(
+    method: String,
+    url: String,
+    headers: HashMap<String, String>,
+    body: Option<String>,
+    query_params: Option<HashMap<String, String>>,
+) -> Result<HttpResponse, String> {
+    let client = reqwest::Client::builder()
+        .timeout(std::time::Duration::from_secs(30))
+        .build()
+        .map_err(|e| e.to_string())?;
+
+    let req_method = method.parse::<reqwest::Method>().map_err(|e| e.to_string())?;
+
+    let mut request_builder = client.request(req_method, &url);
+
+    // Add Query Params
+    if let Some(params) = query_params {
+        request_builder = request_builder.query(&params);
+    }
+
+    // Add Headers
+    for (key, value) in headers {
+        request_builder = request_builder.header(key, value);
+    }
+
+    // Add Body
+    if let Some(b) = body {
+        if !b.is_empty() {
+             request_builder = request_builder.body(b);
+        }
+    }
+
+    let start_time = Instant::now();
+    // Execute request
+    let response = request_builder.send().await.map_err(|e| e.to_string())?;
+    let time_elapsed = start_time.elapsed().as_millis();
+
+    let status = response.status().as_u16();
+    
+    let mut response_headers = HashMap::new();
+    for (key, value) in response.headers() {
+        // Handle header value to string conversion (skipping non-utf8 for simplicity or lossy conv)
+        let val_str = value.to_str().unwrap_or("").to_string();
+        // Capitalize or keep standard key format? keeping standard.
+        response_headers.insert(key.to_string(), val_str);
+    }
+
+    let body_text = response.text().await.map_err(|e| e.to_string())?;
+
+    Ok(HttpResponse {
+        status,
+        headers: response_headers,
+        body: body_text,
+        time_elapsed,
+    })
+}
+
+#[cfg_attr(mobile, tauri::mobile_entry_point)]
+pub fn run() {
+    tauri::Builder::default()
+        .plugin(tauri_plugin_opener::init())
+        .invoke_handler(tauri::generate_handler![greet, execute_request])
+        .run(tauri::generate_context!())
+        .expect("error while running tauri application");
+}

src-tauri/src/main.rs

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+// Prevents additional console window on Windows in release, DO NOT REMOVE!!
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
+
+fn main() {
+    rest_client_lib::run()
+}

src-tauri/tauri.conf.json

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+{
+  "$schema": "https://schema.tauri.app/config/2",
+  "productName": "rest-client",
+  "version": "0.1.0",
+  "identifier": "top.volan.rest-client",
+  "build": {
+    "beforeDevCommand": "pnpm dev",
+    "devUrl": "http://localhost:1420",
+    "beforeBuildCommand": "pnpm build",
+    "frontendDist": "../dist"
+  },
+  "app": {
+    "windows": [
+      {
+        "title": "rest-client",
+        "width": 800,
+        "height": 600
+      }
+    ],
+    "security": {
+      "csp": null
+    }
+  },
+  "bundle": {
+    "active": true,
+    "targets": "all",
+    "icon": [
+      "icons/32x32.png",
+      "icons/128x128.png",
+      "icons/128x128@2x.png",
+      "icons/icon.icns",
+      "icons/icon.ico"
+    ]
+  }
+}