What causes a 400 error when using Graphql with retrofit in an Android application?

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A 400 error in GraphQL usually means that there is a problem with the query syntax, argument values or variable types.

When using Retrofit in an Android application, this error could be caused by:

1. Invalid GraphQL query: The query syntax may not be correct or may contain unsupported characters, resulting in a response of 400 Bad Request.

2. Incorrect argument values: Arguments in the query may have incorrect or invalid values. For example, passing a value that does not match the expected data type.

3. Malformed variables: The variable values provided in the GraphQL request body may be improperly formatted or invalid.

4. Authorization issues: The access token or credentials used for authentication may be invalid or missing, resulting in a 400 response.

To resolve this error, review your GraphQL query and variable values to ensure that they are valid and correctly formatted. Check if any required arguments are missing or if the query schema has changed since the last successful request. Finally, verify that the credentials and access tokens being used are valid and have the necessary permissions.