You must supply a set of HTTP headers when making a request to an eBay REST or GraphQL operation. These headers can include both standard HTTP headers and eBay custom headers. All eBay custom headers start with "X-EBAY-C-".

Some eBay custom headers are packed headers, meaning they can contain multiple name/value pairs. The format for a name/value pair is <name>=<value>, and you must separate multiple values in a single header by commas. The following example shows the general format:

  X-EBAY-C-PACKED-EXAMPLE: fig=7,bar="quux",value=42

The table below presents the standard request headers that eBay accepts, as well as the custom eBay headers that you can use. Although not all possible request headers are listed in this table (some headers are still in flux), the ones listed here are stable.

Note: All headers should be treated as case-insensitive and must follow RFC standards.

HTTP headers for eBay REST and GraphQL requests
HTTP Header	Required	Description
`Accept`	Conditionally required	`Accept` indicates the formats the client accepts for the response. Note: This header pairs with the `Content-Type` header, which specifies the format required by eBay for the request body. Currently, most eBay interfaces require request bodies to be formatted in JSON. See Content-Type Header for details and other supported headers. JSON is the default and only format returned in response bodies. Example: `Accept: application/json`
`Accept-Charset`	Optional	`Accept-Charset` indicates the character sets the client accepts for the response. If the server cannot respond using the value specified in `Accept-Charset`, the server usually ignores the value and without an error responds in `utf-8`. Example: `Accept-Charset: utf-8`
`Accept-Encoding`	Optional – Conditionally recommended	`Accept-Encoding` indicates the compression-encoding algorithms the client accepts for the response. We strongly recommend you include this header in all requests that can potentially return large response payloads. Compression encoding can increase performance by dramatically reducing response-payload size. Currently, `gzip` is the only supported compression format. Example: `Accept-Encoding: gzip`
`Accept-Language`	Conditionally required	`Accept-Language` indicates the natural language and locale preferred by the client for the response. While recommended for all requests, you must supply this header when you are targeting the specific locale of a marketplace that supports multiple locales. For example: Use `fr-BE` when targeting the Française locale of the Belgium marketplace. Use `fr-CA` when targeting the Française locale of the Canadian marketplace. Note: For the language values and locales supported by the different eBay marketplaces, see Marketplace ID values. Example: `Accept-Language: fr-CA`
`Authorization`	Required	`Authorization` specifies the OAuth token and token type used to authorize the request. You must supply this request header in each request you make to the eBay REST interfaces. For details, see OAuth access tokens. Example: `Authorization: Bearer <accessToken>`
`Content-Type`	Conditionally required	`Content-Type` indicates the format of the request body provided by the client. Note: This header pairs with the `Accept` header, which indicates the formats the client accepts for the response. Currently, all Accept headers are formatted in JSON. See Accept Header for details. This header is usually required for all `POST` and `PUT` operations. If omitted in the request, this header defaults to application/json. Supported values include: `Content-Type: application/json` `Content-Type: multipart/form-data` `Content-Type: application/octet-stream`
`Content-Language`	Conditionally required	This header sets the natural language that will be used in request payload fields that support user-defined text. Supported values for this header include `en-US` for English or `de-DE` for German. While recommended for all requests, you must supply this header when you are targeting the specific locale of a marketplace that supports multiple locales. For example: Use `fr-BE` when targeting the Française locale of the Belgium marketplace. Use `fr-CA` when targeting the Française locale of the Canadian marketplace. Note: For the language values and locales supported by the different eBay marketplaces, see Marketplace ID values.

Release Version	Release Date	Description of Release
1.1.0	2025-01-05	Added a two new methods: getMostWatchedItems and getSimilarItems.
1.0.0	2022-01-05	v1 beta version has transitioned to the v1 version after removal of getAlsoBoughtProducts and getAlsoViewedProducts methods.

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