> For the complete documentation index, see [llms.txt](https://docs.appear.sh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.appear.sh/api/headers.md).

# Headers

## List Headers

> List all Headers items.\
> \
> Header is a reusable HTTP header definition with schema, examples, and optional structured content.

```json
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```

## Create Header

> Create a new Header item.\
> \
> Header is a reusable HTTP header definition with schema, examples, and optional structured content.

```json
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```

## Get Header

> Get a Header item by its id.\
> \
> Header is a reusable HTTP header definition with schema, examples, and optional structured content.

```json
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```

## Replace Header

> Completely replaces a Header item by its id.\
> \
> Header is a reusable HTTP header definition with schema, examples, and optional structured content.

```json
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```

## Delete Header

> Delete a Header item by its id.\
> \
> Header is a reusable HTTP header definition with schema, examples, and optional structured content.

```json
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```

## Update Header

> Partially updates a Header item by its id.\
> \
> Header is a reusable HTTP header definition with schema, examples, and optional structured content.

```json
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```

## List Headers

> List all Headers items.\
> \
> Header is a reusable HTTP header definition with schema, examples, and optional structured content.

```json
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```

## Create Header

> Create a new Header item.\
> \
> Header is a reusable HTTP header definition with schema, examples, and optional structured content.

```json
{"openapi":"3.1.0","info":{"title":"Appear API","version":"2.0.0"},"tags":[{"name":"Headers"}],"servers":[{"url":"https://api.appear.sh","description":"Primary public endpoint"}],"security":[{"projectApiKey":[]},{"personalAccessToken":[]}],"components":{"securitySchemes":{"projectApiKey":{"type":"http","scheme":"bearer","bearerFormat":"API Key","description":"Project API key authentication. Use your project API key as a Bearer token in the Authorization header."},"personalAccessToken":{"type":"http","scheme":"bearer","bearerFormat":"JWT","description":"Personal access token authentication. Use your personal access token as a Bearer token in the Authorization header. 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```

## Get Header

> Get a Header item by its id.\
> \
> Header is a reusable HTTP header definition with schema, examples, and optional structured content.

```json
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```

## Replace Header

> Completely replaces a Header item by its id.\
> \
> Header is a reusable HTTP header definition with schema, examples, and optional structured content.

```json
{"openapi":"3.1.0","info":{"title":"Appear API","version":"2.0.0"},"tags":[{"name":"Headers"}],"servers":[{"url":"https://api.appear.sh","description":"Primary public endpoint"}],"security":[{"projectApiKey":[]},{"personalAccessToken":[]}],"components":{"securitySchemes":{"projectApiKey":{"type":"http","scheme":"bearer","bearerFormat":"API Key","description":"Project API key authentication. Use your project API key as a Bearer token in the Authorization header."},"personalAccessToken":{"type":"http","scheme":"bearer","bearerFormat":"JWT","description":"Personal access token authentication. Use your personal access token as a Bearer token in the Authorization header. Suitable for MCP integrations, CLI tools, and other OAuth flows."}},"parameters":{"projectRef":{"schema":{"$ref":"#/components/schemas/projectRef"},"required":true,"description":"Project slug or project id (proj_*)","in":"path","name":"projectRef"},"versionType":{"schema":{"$ref":"#/components/schemas/versionType"},"required":true,"description":"Version type, can be either 'branch' or 'environment'","in":"path","name":"versionType"},"versionSlug":{"schema":{"$ref":"#/components/schemas/versionSlug"},"required":true,"description":"Version slug","in":"path","name":"versionSlug"}},"schemas":{"projectRef":{"anyOf":[{"type":"string","minLength":31,"maxLength":31,"description":"Object ID with prefix \"proj_\""},{"type":"string","minLength":1}],"description":"Project slug or project id (proj_*)"},"versionType":{"type":"string","enum":["branch","environment"],"description":"Version type, can be either 'branch' or 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```

## Delete Header

> Delete a Header item by its id.\
> \
> Header is a reusable HTTP header definition with schema, examples, and optional structured content.

```json
{"openapi":"3.1.0","info":{"title":"Appear API","version":"2.0.0"},"tags":[{"name":"Headers"}],"servers":[{"url":"https://api.appear.sh","description":"Primary public endpoint"}],"security":[{"projectApiKey":[]},{"personalAccessToken":[]}],"components":{"securitySchemes":{"projectApiKey":{"type":"http","scheme":"bearer","bearerFormat":"API Key","description":"Project API key authentication. Use your project API key as a Bearer token in the Authorization header."},"personalAccessToken":{"type":"http","scheme":"bearer","bearerFormat":"JWT","description":"Personal access token authentication. Use your personal access token as a Bearer token in the Authorization header. Suitable for MCP integrations, CLI tools, and other OAuth flows."}},"parameters":{"projectRef":{"schema":{"$ref":"#/components/schemas/projectRef"},"required":true,"description":"Project slug or project id (proj_*)","in":"path","name":"projectRef"},"versionType":{"schema":{"$ref":"#/components/schemas/versionType"},"required":true,"description":"Version type, can be either 'branch' or 'environment'","in":"path","name":"versionType"},"versionSlug":{"schema":{"$ref":"#/components/schemas/versionSlug"},"required":true,"description":"Version slug","in":"path","name":"versionSlug"}},"schemas":{"projectRef":{"anyOf":[{"type":"string","minLength":31,"maxLength":31,"description":"Object ID with prefix \"proj_\""},{"type":"string","minLength":1}],"description":"Project slug or project id (proj_*)"},"versionType":{"type":"string","enum":["branch","environment"],"description":"Version type, can be either 'branch' or 'environment'"},"versionSlug":{"type":"string","minLength":1,"description":"Version slug"}},"responses":{"BadRequestError":{"description":"Invalid request","content":{"application/json":{"schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"error":{"type":"string"},"details":{}},"required":["error"],"additionalProperties":false}}}},"UnauthorizedError":{"description":"Unauthorized","content":{"application/json":{"schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"error":{"type":"string"},"details":{}},"required":["error"],"additionalProperties":false}}}},"ForbiddenError":{"description":"Forbidden","content":{"application/json":{"schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"error":{"type":"string"},"details":{}},"required":["error"],"additionalProperties":false}}}},"NotFoundErrorHeader":{"description":"Header not found","content":{"application/json":{"schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"error":{"type":"string"},"details":{}},"required":["error"],"additionalProperties":false}}}},"InternalServerError":{"description":"Internal Server Error","content":{"application/json":{"schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"error":{"type":"string"},"details":{}},"required":["error"],"additionalProperties":false}}}}}},"paths":{"/v2/catalog/projects/{projectRef}/{versionType}/{versionSlug}/headers/{id}":{"delete":{"summary":"Delete Header","description":"Delete a Header item by its id.\n\nHeader is a reusable HTTP header definition with schema, examples, and optional structured content.","operationId":"delete-header-by-id1","tags":["Headers"],"parameters":[{"$ref":"#/components/parameters/projectRef"},{"$ref":"#/components/parameters/versionType"},{"$ref":"#/components/parameters/versionSlug"},{"schema":{"type":"string","minLength":31,"maxLength":31,"description":"Header identifier"},"required":true,"description":"Header identifier","name":"id","in":"path"}],"responses":{"204":{"description":"Header deleted"},"400":{"$ref":"#/components/responses/BadRequestError"},"401":{"$ref":"#/components/responses/UnauthorizedError"},"403":{"$ref":"#/components/responses/ForbiddenError"},"404":{"$ref":"#/components/responses/NotFoundErrorHeader"},"500":{"$ref":"#/components/responses/InternalServerError"}}}}}}
```

## Update Header

> Partially updates a Header item by its id.\
> \
> Header is a reusable HTTP header definition with schema, examples, and optional structured content.

```json
{"openapi":"3.1.0","info":{"title":"Appear API","version":"2.0.0"},"tags":[{"name":"Headers"}],"servers":[{"url":"https://api.appear.sh","description":"Primary public endpoint"}],"security":[{"projectApiKey":[]},{"personalAccessToken":[]}],"components":{"securitySchemes":{"projectApiKey":{"type":"http","scheme":"bearer","bearerFormat":"API Key","description":"Project API key authentication. Use your project API key as a Bearer token in the Authorization header."},"personalAccessToken":{"type":"http","scheme":"bearer","bearerFormat":"JWT","description":"Personal access token authentication. Use your personal access token as a Bearer token in the Authorization header. 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