Use fetch api as backend on wasm for browser targets

[tolstenko]

Is your feature request related to a problem?

Some of us, like me, I use your library to set up cross-platform URL calls easily. It would make my life easier if I could only use your lib, and it would translate the request to fetchJavaScriptt calls if on the web assembly environment.

Possible Solution

Check if the EMSCRIPTEN, wasm, wasm32, or wasm64 flag is set. If so, use the fetch API from Javascript instead.

ex.:

#include <emscripten/fetch.h>
#include <stdio.h>

void on_success(emscripten_fetch_t *fetch) {
    printf("Received %llu bytes: %s\n", fetch->numBytes, fetch->data);
    emscripten_fetch_free(fetch);
}

void on_failure(emscripten_fetch_t *fetch) {
    printf("Fetch failed: HTTP status %d\n", fetch->status);
    emscripten_fetch_free(fetch);
}

int main() {
    emscripten_fetch_attr_t attr;
    emscripten_fetch_attr_init(&attr);
    attr.onsuccess = on_success;
    attr.onerror = on_failure;
    attr.requestMethod = "GET";

    printf("Fetching data...\n");
    emscripten_fetch(&attr, "https://api.example.com/data");

    return 0;
}

Alternatives

Internally, I am manually checking that in the way I told you above :-)

Additional Context

No response