How do React Native proxies differ from vanilla React proxies in their functionality?

Trying to retrieve data from an API running locally on port 5000 of my device, I recalled setting the proxy in package.json when working on React web applications:

"proxy": "https://localhost:5000"

Attempting to fetch information from the API using this method:

fetch("/colours", {
        method: "GET",
        headers: {
            "Content-Type": "application/json;charset=utf-8"
        }
    })...

Unfortunately, upon running the application in my browser, it still indicates sending the request to http://localhost:19006/colours and the response contains HTML for a reload button.

Reviewing my API's console showed that no requests were reaching it. I attempted common troubleshooting methods like deleting package-lock.json and node_modules, then reinstalling them. However, the issue persists.

Could my approach to API requests be fundamentally incorrect for React Native?

typescriptreact-nativefetch-api

Answer №1

React Native operates differently from browser-based frameworks, causing network requests to function in a unique manner. The use of fetch directing to localhost:19006 suggests Metro is running on that specific port.

To achieve the desired outcome, it may be best to define the URL within your code. Alternatively, setting it in your environment and utilizing tools like react-native-config is a common practice.

This code snippet demonstrates fetching with an inline-defined URL:

const API_URL = 'http://192.168.X.X:5000'

const options = { ... }

fetch(API_URL + '/colors', options)
  .then(console.log);

Note: Avoid using localhost as it will only work in the iOS simulator (and potentially in a browser). Instead, utilize your local IP address. This is due to the fact that the iOS simulator is the sole "device" sharing your machine's network configuration. The Android emulator or any physical device will not have this capability.

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