Error: write EPROTO error:100000f7:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER

# Error: write EPROTO error:100000f7:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER

The "Error: write EPROTO error:100000f7:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER" occurs when you issue a POST request using https as the protocol when the API only supports http.

To solve the error, update the protocol to http if your API only supports http.

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Error: write EPROTO 29264261692936:error:100000f7:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER:../../third_party/boringssl/src/ssl/tls_record.cc:242:

# Update your URL to use http instead of https

Update your URL to use http instead of https.

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# ⛔️ Incorrect (uses https)
https://localhost:3456/articles

# ✅ Correct (uses http)
http://localhost:3456/articles

Here is a simple Express.js server to reproduce the error.

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const express = require('express');

const app = express();

app.post('/articles', function requestHandler(req, res) {
  res.end('bobbyhadz.com');
});

const port = 3456;

app.listen(port, () => {
  console.log(`Example app listening on port ${port}`);
});

Starting the server with node index.js and making a POST request to https://localhost:3456/articles causes the following error.

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Error: write EPROTO 29264261692936:error:100000f7:SSL routines:OPENSSL_internal:WRONG_VERSION_NUMBER:../../third_party/boringssl/src/ssl/tls_record.cc:242:

However, if I make a POST request to http://localhost:3456/articles (note http protocol), I get a 200 OK response back.

# Making HTTP requests to APIs in Postman

The error often occurs when making HTTP requests to APIs in Postman.

Make sure to set the protocol to http and not https.

If you have a custom axios instance, make sure you aren't setting the baseURL property to a URL that has the https protocol.

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// 👇️ Uses http protocol
const instance = axios.create({
  baseURL: 'http://api.example.com'
});

# Additional Resources

You can learn more about the related topics by checking out the following tutorials:

• Unable to verify the first certificate in Node.js & Postman
• The engine "node" is incompatible with this module
• How to clear all Cookies or a specific Cookie in Postman
• Could not get any response Postman Error [Solved]