# How to make real/working calls to subscription-queries within Java

**URL:** <https://community.bitquery.io/t/how-to-make-real-working-calls-to-subscription-queries-within-java/1607>\
**Category:** GraphQL API\
**Created:** [August 14, 2023, 5:14pm UTC](https://community.bitquery.io/t/how-to-make-real-working-calls-to-subscription-queries-within-java/1607 "2023-08-14T17:14:34Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Reinhard2500](https://sea2.discourse-cdn.com/flex016/user_avatar/community.bitquery.io/reinhard2500/32/790_2.png) [@Reinhard2500](https://community.bitquery.io/u/Reinhard2500)\
**Post date:** [August 14, 2023, 5:14pm UTC](https://community.bitquery.io/t/how-to-make-real-working-calls-to-subscription-queries-within-java/1607/1 "2023-08-14T17:14:34Z")

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What I seem to understand from Python samples … WebSockets are needed.  
Has anyone got a sample for that ?

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**Author:** ![Divya](https://avatars.discourse-cdn.com/v4/letter/d/13edae/32.png) [@Divya](https://community.bitquery.io/u/Divya)\
**Post date:** [August 15, 2023, 5:38am UTC](https://community.bitquery.io/t/how-to-make-real-working-calls-to-subscription-queries-within-java/1607/2 "2023-08-15T05:38:10Z")

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Here’s the sample postman collection:

[https://www.postman.com/spacecraft-geologist-86385692/workspace/bitquery](https://www.postman.com/spacecraft-geologist-86385692/workspace/bitquery)

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**Author:** ![Reinhard2500](https://sea2.discourse-cdn.com/flex016/user_avatar/community.bitquery.io/reinhard2500/32/790_2.png) [@Reinhard2500](https://community.bitquery.io/u/Reinhard2500)\
**Post date:** [August 15, 2023, 6:32am UTC](https://community.bitquery.io/t/how-to-make-real-working-calls-to-subscription-queries-within-java/1607/3 "2023-08-15T06:32:47Z")

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Thanks for the feedback!  
.addHeader(“Sec-WebSocket-Protocol”, “graphql-ws”)  
Was vital in defining a Request in Java … so my problem is solved.  
have a great day!