[feat] Proxy support in fetch function in tauri's http API

[allala0]

Describe the problem

There is no support for using proxies in fetch function in tauri's http API.

Describe the solution you'd like

Support proxies with and without authentication in fetch function in tauri's http API.
Proxy will be one of feth's function parameters, and could be passed with authentication data like: "username:password@host:port" or without authentication data: "host:port".
Example of fetch function call with proxy parameter:

const response = await fetch("https://www.google.com", { method: "GET", proxy: "admin:admin@123.123.321.321:8080" });

Alternatives considered

No response

Additional context

This feature is frequently needed when app includes some web scraping, I personally started coding my own project in Tauri, but lack of proxy supprort is blocking me right now from finishing the project :/

[maku]

I would also need to be able to set a proxy.

But to be clear: this option should also to be available for the client you create via getClient() from "@tauri-apps/api/http"

[yizhiyan]

I think this design would be better

const response = await fetch("https://www.google.com", { method: "GET", proxy: "http://admin:admin@123.123.321.321:8080" });

It would be even better if you could set the proxy type

[FabianLars]

It would be even better if you could set the proxy type

What types are there? And do you have an idea how it should look like api wise?

On that topic, do you guys have examples from other libraries that support this and where you like the api design?

[ugger0101]

if you use external Js modules, such as axios + socks-proxy-agent, that may be able to meet your needs. Unfortunately, it works in theory and has been verified in electron, but it does not work in tauri.
I think it may be a problem in my code or that the webview-based tauri is different from the eletron which based nodejs, but I recommend you try it anyway

[Pylogmon]

I found that setting environment variables in the code is useful for tauri/http, but it has no effect for ajax

std::env::set_var("HTTP_PROXY","http://127.0.0.1:7890");
std::env::set_var("HTTPS_PROXY","http://127.0.0.1:7890");
std::env::set_var("ALL_PROXY","http://127.0.0.1:7890");

[iwinux]

On macOS, if you start the app with yarn tauri dev or open foo.app from CLI, the app picks up existing http_proxy and https_proxy environment variables properly, and http.fetch() uses the proxy as expected.

However, when the app is launched directly, it has no access to these environment variables. It should have respected macOS system proxy settings instead of relying on environment variables, just as other native apps do.

[amrbashir]

This will be support in v2 in tauri-plugin-http, see tauri-apps/plugins-workspace#824