graphql mutation via curl with variables. Content-Type application/json or /graphql ?

[palacios]

Hello,

I'm having troubles to declare variables in graphql and send them via curl. On this forum I found this post, but it wasn't closed and still doesn't solve my problem

https://community.shopify.com/c/shopify-apis-and-sdks/declare-variables-in-a-mutation-using-php-and-...

Whenever I use the Content-Type defined as application/json instead of application/graphql, Shopify sends me back the error Bad Request

For example with this curl

curl -X POST \
https://my-site.myshopify.com/admin/api/2022-04/graphql.json \
-H 'Content-Type: application/json' \
-H 'X-Shopify-Access-Token: my-token' \
-d '{
 "query": "mutation productUpdate($input: ProductInput!) {
  productUpdate(input: $input) {
    product {
      id
    }
    userErrors {
      field
      message
    }
  }
}",
"variables":{
  "input": 
    {
      "id": "gid://shopify/Product/{product_id}",
      "title": "New title",
      "descriptionHtml": "<p>Update from GraphQL Admin API</p>"
    }
  }
}'

I get back the same message Bad Request also it I try the curl on the Shopify Docs here https://shopify.dev/api/admin-graphql/2022-04/mutations/productUpdate#examples-Update_a_product_s_ti...

Instead, if I use the the Content-Type as application/graphql, I get the same problem of the post I linked here above, something like

{"errors":[{"message":"Parse error on \"query\" (STRING) at [3, 5]","locations":[{"line":2,"column":2}]}]}

Thank you for any input!

[m8th · Accepted solution]

Looks like it only works if the query part does not contain newlines.

In the API documentation are also all examples without newlines in the query part.

curl -X POST \
https://my-site.myshopify.com/admin/api/2022-04/graphql.json \
-H 'Content-Type: application/json' \
-H 'X-Shopify-Access-Token: my-token' \
-d '{
"query": "mutation productUpdate($input: ProductInput!) { productUpdate(input: $input) { product { id } userErrors { field message } } }",
"variables":{
  "input": 
    {
      "id": "gid://shopify/Product/{product_id}",
      "title": "New title",
      "descriptionHtml": "<p>Update from GraphQL Admin API</p>"
    }
  }
}'

[palacios]

Thanks a lot!