# Get expected-vs-actual diff for a failing regression test result

**GET /runs/{run_id}/samples/{sample_id}/diff**

The legacy diff route is header-gated (X-Requested-With: XMLHttpRequest), not role-gated. The 403 seen on direct browser requests was a header-check artifact. This endpoint wraps the XHR logic and returns structured JSON — no HTML, no 50-line truncation.



## Servers
- Production: https://sampleplatform.ccextractor.org/api/v1 (Production)


## Authentication methods
- Bearer auth


## Parameters

### Path parameters
- **run_id** (integer)
  Numeric run ID
- **sample_id** (integer)
  Numeric sample or regression result ID

### Query parameters
- **regression_id** (integer)
  Regression test definition ID
- **output_id** (integer)
  Output file ID within a regression test definition
- **context_lines** (integer)

- **format** (string)



## Responses
### 200
Structured or unified diff

#### Body: application/json (object)
- **run_id** (integer)

- **sample_id** (integer)

- **regression_id** (integer)

- **output_id** (integer)

- **status** (string)

- **summary** (object)

- **hunks** (array[object])


### 401
Missing, expired, or invalid bearer token

#### Body: application/json (object)
- **code** (string)
  Machine-readable error code (snake_case)
- **message** (string)
  Human-readable error summary
- **details** (object)
  Structured context for the error. Always an object, never null. Empty object {} when no additional detail is available.

### 404
Resource not found

#### Body: application/json (object)
- **code** (string)
  Machine-readable error code (snake_case)
- **message** (string)
  Human-readable error summary
- **details** (object)
  Structured context for the error. Always an object, never null. Empty object {} when no additional detail is available.

### 429
Too many requests. Retry after the indicated number of seconds.
#### Headers
- **Retry-After** (integer)
  Seconds to wait before retrying
- **X-RateLimit-Limit** ()
  Maximum requests allowed in the current window
- **X-RateLimit-Remaining** ()
  Requests remaining in the current window
- **X-RateLimit-Reset** ()
  Unix timestamp when the rate limit window resets

#### Body: application/json (object)
- **code** (string)
  Machine-readable error code (snake_case)
- **message** (string)
  Human-readable error summary
- **details** (object)
  Structured context for the error. Always an object, never null. Empty object {} when no additional detail is available.

### default
Unexpected server error

#### Body: application/json (object)
- **code** (string)
  Machine-readable error code (snake_case)
- **message** (string)
  Human-readable error summary
- **details** (object)
  Structured context for the error. Always an object, never null. Empty object {} when no additional detail is available.


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