# Connection Error

**URL:** <https://community.apollographql.com/t/connection-error/5985>\
**Category:** Client SDKs\
**Tags:** server, web\
**Created:** [March 21, 2023, 9:09am UTC](https://community.apollographql.com/t/connection-error/5985 "2023-03-21T09:09:12Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![punitsu](https://sea1.discourse-cdn.com/flex019/user_avatar/community.apollographql.com/punitsu/32/4066_2.png) [@punitsu](https://community.apollographql.com/u/punitsu)\
**Post date:** [March 21, 2023, 9:09am UTC](https://community.apollographql.com/t/connection-error/5985/1 "2023-03-21T09:09:12Z")

</div>

```auto
const { ApolloClient, InMemoryCache, HttpLink } = require('@apollo/client');
const fetch = require('cross-fetch');

const headers = {
  "Content-Type": "application/json",
  "Hasura-Client-Name": "hasura-console",
  "x-hasura-admin-secret": "myadminsecretkey",
};

const client = new ApolloClient({
  link: new HttpLink({
    uri: "http://localhost:8081/v1/graphql",
    headers,
    fetch
  }),
  cache: new InMemoryCache()
});

```

module.exports = client;

**Using this to initialise my client is throwing me error:**

```auto
leave-tracker-functions-1 | networkError: FetchError: request to http://localhost:8081/v1/graphql failed, reason: connect ECONNREFUSED 127.0.0.1:8081
leave-tracker-functions-1 | at ClientRequest.<anonymous> (/app/node_modules/cross-fetch/node_modules/node-fetch/lib/index.js:1491:11)
leave-tracker-functions-1 | at ClientRequest.emit (node:events:513:28)
leave-tracker-functions-1 | at Socket.socketErrorListener (node:_http_client:494:9)
leave-tracker-functions-1 | at Socket.emit (node:events:513:28)
leave-tracker-functions-1 | at emitErrorNT (node:internal/streams/destroy:157:8)
leave-tracker-functions-1 | at emitErrorCloseNT (node:internal/streams/destroy:122:3)
leave-tracker-functions-1 | at processTicksAndRejections (node:internal/process/task_queues:83:21) {
leave-tracker-functions-1 | type: 'system',
leave-tracker-functions-1 | errno: 'ECONNREFUSED',
leave-tracker-functions-1 | code: 'ECONNREFUSED'
leave-tracker-functions-1 | },
leave-tracker-functions-1 | extraInfo: undefined
leave-tracker-functions-1 | }

```

I tried using host.docker.internal, it didn’t work.  
What worked for me is  
` uri: 'http://leave-tracker-graphql-engine-1:8080/v1/graphql',`

I’m trying to understand why this works.

Config for my hasura docker container:

```auto
graphql-engine:
    image: hasura/graphql-engine:v2.16.1
    ports:
      - "8081:8080"

```

---

<div class="post-metadata">

**Author:** ![Justin\_Gonzalez](https://sea1.discourse-cdn.com/flex019/user_avatar/community.apollographql.com/justin_gonzalez/32/5359_2.png) [@Justin\_Gonzalez](https://community.apollographql.com/u/Justin_Gonzalez)\
**Post date:** [February 6, 2025, 8:49pm UTC](https://community.apollographql.com/t/connection-error/5985/2 "2025-02-06T20:49:14Z")

</div>

Archived on February 6, 2025, 8:49pm UTC