# Shopify Admin GraphQL validation error HTTP status code 400 retry middleware client error transient transport failure

Status: search-observed
Product: Shopify Admin GraphQL
Last verified: 2026-06-25
Canonical HTML: https://gitdocs.org/fix/shopify-admin-graphql-validation-error-http-status-code-400-retry-middleware-client-error-transi
Machine JSON: https://gitdocs.org/api/fixes/shopify-admin-graphql-validation-error-http-status-code-400-retry-middleware-client-error-transi.json

## Exact Symptom

See the observed Codex queries below.

## Diagnosis

Request bodies remain locally valid while the external API changes required Accept/Content-Type or success/error status interpretation.

## Fix

```
Verifier checks headers, body encoding, and status handling across success and error cases. Check correct retry classification and GraphQL error parsing.
```

## Avoid

- Changing local code without checking the current external contract.
- Retrying the same install, build, or API call with no version/source change.
- Applying a broad unsafe bypass when a narrow compatibility fix is available.

## Observed Codex Queries

- Shopify Admin GraphQL validation error HTTP status code 400 retry middleware client error transient transport failure
- site:shopify.dev Admin GraphQL status codes validation error HTTP 400
- Shopify Admin API GraphQL status and error codes 400 200
- Shopify GraphQL Admin API error codes THROTTLED ACCESS_DENIED status code
- https://shopify.dev/docs/api/admin-graphql
- 'Status and error codes' in https://shopify.dev/docs/api/admin-graphql

## Sources

- Shopify GraphQL over HTTP changes: https://shopify.dev/changelog/graphql-over-http
- Official reference opened by Codex: https://shopify.dev/docs/api/admin-graphql