Boundary not added automatically to headers for multi part (AEM server 6.1)

   @Multipart
    @POST("/crx/packmgr/update.jsp")
    @Headers("Content-Type: multipart/form-data; charset=UTF-8")
    fun updatePackage(
            @Part("path") path: String?,
            @Part("packageName") packageName: String,
            @Part("groupName") groupName: String,
            @Part("version") packageVersion: String = "",
            @Part("description") description: String = "",
            @Part("filter") filter: String,
            @Part("_charset_") charset: String = "UTF-8"
    ): Single<PackageResponse>

` Jan 24, 2019 1:10:48 PM okhttp3.internal.platform.Platform log INFO: --> POST https://qa.author.st.com:8088/crx/packmgr/update.jsp http/1.1 Jan 24, 2019 1:10:48 PM okhttp3.internal.platform.Platform log INFO: Content-Type: multipart/form-data; charset=UTF-8 Jan 24, 2019 1:10:48 PM okhttp3.internal.platform.Platform log INFO: Content-Length: 1540 Jan 24, 2019 1:10:48 PM okhttp3.internal.platform.Platform log INFO: Host: qa.author.st.com:8088 Jan 24, 2019 1:10:48 PM okhttp3.internal.platform.Platform log INFO: Connection: Keep-Alive Jan 24, 2019 1:10:48 PM okhttp3.internal.platform.Platform log INFO: Accept-Encoding: gzip Jan 24, 2019 1:10:48 PM okhttp3.internal.platform.Platform log INFO: Cookie: login-token=61f72fad-2693-49e3-a89d-db37e7926d8e%3af16817d3-7f1f-4b3b-a0d5-57f4232b33e1_8d173c0bb246cf68%3acrx.default Jan 24, 2019 1:10:48 PM okhttp3.internal.platform.Platform log INFO: User-Agent: okhttp/3.12.1 Jan 24, 2019 1:10:48 PM okhttp3.internal.platform.Platform log INFO: Jan 24, 2019 1:10:48 PM okhttp3.internal.platform.Platform log INFO: --f30bd60b-95c6-464b-bb53-edf710141c5b Content-Disposition: form-data; name=“path” Content-Transfer-Encoding: binary Content-Type: text/plain; charset=utf-8 Content-Length: 32

/etc/packages/6D-temp/test-1.zip –f30bd60b-95c6-464b-bb53-edf710141c5b Content-Disposition: form-data; name=“packageName” Content-Transfer-Encoding: binary Content-Type: text/plain; charset=utf-8 Content-Length: 4`

Server response 24.01.2019 10:44:33.969 *ERROR* [qtp504462445-94283] com.day.crx.packmgr.impl.support.HttpMultipartPost Error while processing multipart. org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found

browser request headers: Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8 Accept-Encoding: gzip, deflate, br Accept-Language: en-US,en;q=0.9,ru-RU;q=0.8,ru;q=0.7 Cache-Control: max-age=0 Connection: keep-alive Content-Length: 1049 Content-Type: multipart/form-data; boundary=----WebKitFormBoundary9QKaR8Q1as5jUUt7

[JakeWharton]

Delete your explicit @Headers annotation. The content type is added with a boundary automatically for all @Multipart requests.

[VatslauX]

@JakeWharton Thank You - it works. Is it possible to set a custom boundary pattern? like --xxxxxxxx If server expected for example timestamp