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I’m developing an API on Node.js + express on Heroku, and every time I fetch anything with POST, I get a 400 Bad request error.


Postman requests to the same endpoint work perfectly. So the only hypothesis I have is that I need a ‘Host’ header in my Airtable request (when I remove the ‘Host’ header in Postman. I get the same 400 Bad request error), but I don’t know what this ‘Host’ header should be.


To reproduce:



  1. Create a simple Node.js+express app on Heroku where you return the same body as you get:


app.post('/', (request, response) => {

 response.status(200).send(request.body);

})


  1. Create Airtable automation with fetch (or an app with remoteFetchAsync):


let response = await fetch('https://....herokuapp.com/api/', {

                    method: 'POST',

                    body: JSON.stringify('Hello World!'),

                    headers: {

                        'Content-Type': 'application/json; charset=UTF-8',

                        'Accept': 'application/json'

                    },

                });

console.log(await response.text());

You’ll get a ‘400 Bad Request’ response.

Solved!


I had to add 'Host': 'https://*.airtableblocks.com' header.


await remoteFetchAsync('https://....herokuapp.com/api/', {

                    method: 'POST',

                    body: requestBody,

                    headers: {

                        'Content-Type': 'application/json; charset=UTF-8',

                        'Host': 'https://*.airtableblocks.com',

                        'Accept': 'application/json'

                    },

                })

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