@@ -4399,8 +4399,8 @@ paths:

           in: "header"

           type: "string"

           enum:

-            - "application/tar"

-          default: "application/tar"

+            - "application/x-tar"

+          default: "application/x-tar"

         - name: "X-Registry-Config"

           in: "header"

           description: |

@@ -29,7 +29,7 @@ func (cli *Client) ImageBuild(ctx context.Context, buildContext io.Reader, optio

 		return types.ImageBuildResponse{}, err

 	}

 	headers.Add("X-Registry-Config", base64.URLEncoding.EncodeToString(buf))

-	headers.Set("Content-Type", "application/tar")

+	headers.Set("Content-Type", "application/x-tar")

 	serverResp, err := cli.postRaw(ctx, "/build", query, buildContext, headers)

 	if err != nil {

@@ -170,8 +170,8 @@ func TestImageBuild(t *testing.T) {

 					return nil, fmt.Errorf("X-Registry-Config header not properly set in the request. Expected '%s', got %s", buildCase.expectedRegistryConfig, registryConfig)

 				}

 				contentType := r.Header.Get("Content-Type")

-				if contentType != "application/tar" {

-					return nil, fmt.Errorf("Content-type header not properly set in the request. Expected 'application/tar', got %s", contentType)

+				if contentType != "application/x-tar" {

+					return nil, fmt.Errorf("Content-type header not properly set in the request. Expected 'application/x-tar', got %s", contentType)

 				}

 				// Check query parameters

@@ -12,7 +12,7 @@ import (

 // PluginCreate creates a plugin

 func (cli *Client) PluginCreate(ctx context.Context, createContext io.Reader, createOptions types.PluginCreateOptions) error {

 	headers := http.Header(make(map[string][]string))

-	headers.Set("Content-Type", "application/tar")

+	headers.Set("Content-Type", "application/x-tar")

 	query := url.Values{}

 	query.Set("name", createOptions.RepoName)

@@ -1192,6 +1192,7 @@ Build an image from a Dockerfile

 **Example request**:

     POST /v1.18/build HTTP/1.1

+    Content-Type: application/x-tar

     {% raw %}

     {{ TAR STREAM }}

@@ -1246,7 +1247,7 @@ or being killed.

 **Request Headers**:

--   **Content-type** – Set to `"application/tar"`.

+-   **Content-type** – Set to `"application/x-tar"`.

 -   **X-Registry-Config** – base64-encoded ConfigFile object

 **Status codes**:

@@ -1236,6 +1236,7 @@ Build an image from a Dockerfile

 **Example request**:

     POST /v1.19/build HTTP/1.1

+    Content-Type: application/x-tar

     {% raw %}

     {{ TAR STREAM }}

@@ -1292,7 +1293,7 @@ or being killed.

 **Request Headers**:

--   **Content-type** – Set to `"application/tar"`.

+-   **Content-type** – Set to `"application/x-tar"`.

 -   **X-Registry-Config** – base64-encoded ConfigFile object

 **Status codes**:

@@ -1365,6 +1365,7 @@ Build an image from a Dockerfile

 **Example request**:

     POST /v1.20/build HTTP/1.1

+    Content-Type: application/x-tar

     {% raw %}

     {{ TAR STREAM }}

@@ -1425,7 +1426,7 @@ or being killed.

 **Request Headers**:

--   **Content-type** – Set to `"application/tar"`.

+-   **Content-type** – Set to `"application/x-tar"`.

 -   **X-Registry-Config** – A base64-url-safe-encoded Registry Auth Config JSON

         object with the following structure:

@@ -1448,6 +1448,7 @@ Build an image from a Dockerfile

 **Example request**:

     POST /v1.21/build HTTP/1.1

+    Content-Type: application/x-tar

     {% raw %}

     {{ TAR STREAM }}

@@ -1514,7 +1515,7 @@ or being killed.

 **Request Headers**:

--   **Content-type** – Set to `"application/tar"`.

+-   **Content-type** – Set to `"application/x-tar"`.

 -   **X-Registry-Config** – A base64-url-safe-encoded Registry Auth Config JSON

         object with the following structure:

@@ -1627,6 +1627,7 @@ Build an image from a Dockerfile

 **Example request**:

     POST /v1.22/build HTTP/1.1

+    Content-Type: application/x-tar

     {% raw %}

     {{ TAR STREAM }}

@@ -1694,7 +1695,7 @@ or being killed.

 **Request Headers**:

--   **Content-type** – Set to `"application/tar"`.

+-   **Content-type** – Set to `"application/x-tar"`.

 -   **X-Registry-Config** – A base64-url-safe-encoded Registry Auth Config JSON

         object with the following structure:

@@ -1662,6 +1662,7 @@ Build an image from a Dockerfile

 **Example request**:

     POST /v1.23/build HTTP/1.1

+    Content-Type: application/x-tar

     {% raw %}

     {{ TAR STREAM }}

@@ -1730,7 +1731,7 @@ or being killed.

 **Request Headers**:

--   **Content-type** – Set to `"application/tar"`.

+-   **Content-type** – Set to `"application/x-tar"`.

 -   **X-Registry-Config** – A base64-url-safe-encoded Registry Auth Config JSON

         object with the following structure:

@@ -1659,6 +1659,7 @@ Build an image from a Dockerfile

 **Example request**:

     POST /v1.24/build HTTP/1.1

+    Content-Type: application/x-tar

     {% raw %}

     {{ TAR STREAM }}

@@ -1727,7 +1728,7 @@ or being killed.

 **Request Headers**:

--   **Content-type** – Set to `"application/tar"`.

+-   **Content-type** – Set to `"application/x-tar"`.

 -   **X-Registry-Config** – A base64-url-safe-encoded Registry Auth Config JSON

         object with the following structure:

@@ -8,9 +8,8 @@ import (

 // MimeTypes stores the MIME content type.

 var MimeTypes = struct {

 	TextPlain   string

-	Tar         string

 	OctetStream string

-}{"text/plain", "application/tar", "application/octet-stream"}

+}{"text/plain", "application/octet-stream"}

 // DetectContentType returns a best guess representation of the MIME

 // content type for the bytes at c.  The value detected by