SharePoint Node/Lobby

Hi. Could you please help me make sp-rest-proxy correctly work with batching? It drives me crazy...
Let the example be https://pnp.github.io/pnpjs/sp/docs/items/#update-multiple-items. Proxy gets POST request with payload:

--batch_b18ca450-d9dc-40c7-8855-b7de9a621369
Content-Type: multipart/mixed; boundary="changeset_91eacb9d-a188-47d2-8b97-99f97271f926"

--changeset_91eacb9d-a188-47d2-8b97-99f97271f926
Content-Type: application/http
Content-Transfer-Encoding: binary

MERGE http://localhost:3000/sites/internalsites/Recruiting/_api/web/lists/getByTitle('rapidupdate')/items(1) HTTP/1.1
accept: application/json; odata=verbose
content-type: application/json;odata=verbose;charset=utf-8
if-match: *
x-clientservice-clienttag: PnPCoreJS:@pnp-1.2.8

{"__metadata":{"type":"SP.Data.CustomListListItem"},"Title":"Batch 6"}

--changeset_91eacb9d-a188-47d2-8b97-99f97271f926
Content-Type: application/http
Content-Transfer-Encoding: binary

MERGE http://localhost:3000/sites/internalsites/Recruiting/_api/web/lists/getByTitle('rapidupdate')/items(2) HTTP/1.1
accept: application/json; odata=verbose
content-type: application/json;odata=verbose;charset=utf-8
if-match: *
x-clientservice-clienttag: PnPCoreJS:@pnp-1.2.8

{"__metadata":{"type":"SP.Data.CustomListListItem"},"Title":"Batch 7"}

--changeset_91eacb9d-a188-47d2-8b97-99f97271f926--

--batch_b18ca450-d9dc-40c7-8855-b7de9a621369--

but result is

--batchresponse_c92f0856-7428-4f77-ba5e-a9c84f24bf68
Content-Type: application/http
Content-Transfer-Encoding: binary

HTTP/1.1 400 Bad Request
CONTENT-TYPE: application/json;odata=verbose;charset=utf-8

{"error":{"code":"-1, Microsoft.SharePoint.Client.InvalidClientQueryException","message":{"lang":"en-US","value":"Invalid request."}}}
--batchresponse_c92f0856-7428-4f77-ba5e-a9c84f24bf68
Content-Type: application/http
Content-Transfer-Encoding: binary

HTTP/1.1 400 Bad Request
CONTENT-TYPE: application/json;odata=verbose;charset=utf-8

{"error":{"code":"-1, Microsoft.SharePoint.Client.InvalidClientQueryException","message":{"lang":"en-US","value":"Invalid request."}}}
--batchresponse_c92f0856-7428-4f77-ba5e-a9c84f24bf68--

If I deploy this code to dev SharePoint 2016 page it does updates without errors.
sp-rest-proxy changes site name correctly: POST (batch): http://bss-ihome2016/sites/internalsites/Recruiting/_api/$batch
I've red lots of articles, also this koltyakov/sp-rest-proxy#42 , but in my case it looks OK, but does not OK.