How to allow 3rd party apps to send POST requests to your API

I'm exporting data from a 3rd party app which sends a POST request to an api in my app. The problem is it works when I test it locally by exposing my local port through ngrok but when I deploy to Vercel my endpoint doesn't get hit at all and I get an error from the 3rd party app with a not so helpful error message.

I've explored messing with CORS but that didn't fix it, assuming that I'm modifying the CORS settings correctly.

WWO I'm exporting data from a 3rd party app which sends a POST request to an api in ...

Sunless•6/27/23, 3:44 AM

For me to properly eval. the situation, you'll have to give more details on :

how your POST api endpoint is set (some snippet)
how a 3rd party app is requesting that endpoint

Sunless•6/27/23, 3:45 AM

because with API endpoints, cors is not an issue, cors is only for the clientside browser JS scripts from one domain(example.com) making request to domains which are not example.com

SSunless For me to properly eval. the situation, you'll have to give more details on : -...

WOOP•6/27/23, 3:52 AM

Here is an example of the API endpoint

WOOP•6/27/23, 3:56 AM

The 3rd party app asks for a base url and then it adds on some extra stuff to the url to make it unique.

ex)
I give the 3rd party app https://example.com/api/exampleRoute
The 3rd party app tacks on /[platform]/[leagueId] to it to make it unique so the resulting url is https://example.com/api/exampleRoute/[platform]/[leagueId]

Sunless•6/27/23, 3:59 AM

and where is this api endpoint situated in your file structure? the root src dir starting from

pages

pages

app

app

WOOP•6/27/23, 4:00 AM

pages

Sunless•6/27/23, 4:00 AM

so in pages

Sunless•6/27/23, 4:00 AM

is it in the ?

Sunless•6/27/23, 4:00 AM

*I forgot the pages notation hold up

WOOP•6/27/23, 4:00 AM

Yea thats right.

Sunless•6/27/23, 4:01 AM

it should be in

Sunless•6/27/23, 4:01 AM

*what I meant

Sunless•6/27/23, 4:01 AM

so if it's there and it's deployed to vercel, then you should be able to simply POST to it

Sunless•6/27/23, 4:01 AM

also

WOOP•6/27/23, 4:01 AM

Yea thats how I have it setup

Sunless•6/27/23, 4:01 AM

in the starting of the api handler

Sunless•6/27/23, 4:03 AM

oh wait nvm

Sunless•6/27/23, 4:03 AM

it's not a json request

Sunless•6/27/23, 4:04 AM

anyways now that that's confirmed, can you show me a stack trace of the thrown error? if possible

WOOP•6/27/23, 4:04 AM

Gotcha. Also something to note is im doing this on a Vercel preview deployment not sure if that matters

WWO Gotcha. Also something to note is im doing this on a Vercel preview deployment n...

Sunless•6/27/23, 4:04 AM

as long as the endpoint is exposed, it should be requestable

Sunless•6/27/23, 4:04 AM

I haven't worked with vercel deployments other than once or twice, so I can't say for sure

SSunless anyways now that that's confirmed, can you show me a stack trace of the thrown e...

WOOP•6/27/23, 4:05 AM

There isnt much of a stack trace because on the vercel logs it doesnt even show that my endpoint is being hit even though i put in the base url that it generated

WWO There isnt much of a stack trace because on the vercel logs it doesnt even show ...

Sunless•6/27/23, 4:06 AM

did you try to test a request via

curl

curl

or ?

Sunless•6/27/23, 4:06 AM

to your api endpoint?

WOOP•6/27/23, 4:06 AM

Im not familiar with that but I can try it now

WWO Im not familiar with that but I can try it now

Sunless•6/27/23, 4:07 AM

just use a rest client

Sunless•6/27/23, 4:07 AM

anything, postman, insomnia etc.

Sunless•6/27/23, 4:07 AM

or thunder client, the one vscoders use

SSunless just use a rest client

WOOP•6/27/23, 4:09 AM

Im getting a 200 from postman

WWO Im getting a 200 from postman

Sunless•6/27/23, 4:10 AM

is the response okay?

Sunless•6/27/23, 4:10 AM

other than the 200

Sunless•6/27/23, 4:10 AM

the body, headers etc.

Sunless•6/27/23, 4:11 AM

if they are, then there's and issue with the way the 3rd party is requesting at your endpoint

Sunless•6/27/23, 4:11 AM

your api is properly setup

WOOP•6/27/23, 4:12 AM

Yea there is something going wrong between the 3rd party and Vercel I think because the 3rd party works fine with ngrok

WWO Yea there is something going wrong between the 3rd party and Vercel I think beca...

Sunless•6/27/23, 4:12 AM

wait....

Sunless•6/27/23, 4:12 AM

did you test to a local http url or the vecel one?

WOOP•6/27/23, 4:12 AM

the vercel deployment url

Sunless•6/27/23, 4:13 AM

then your 3rd party client is not properly requesting