401 Unauthorized when use Mountebank to mock outer API with NTLM authorization

[Glazz87]

I want to mock external API which has NTLM authorization. When I make a request directly to this API (via Postman) everything is ok, responce has correct body and status 200. But if I make request through Mountebank (in proxyTransparent mode) I have 401 Unauthorized.

OS         : Windows Server 2012 R2
mountebank : 2.1.2
node.js    : 10.10.0
Installation method : npm

Log contents in mb.log when running mb --loglevel debug

{"message":"[https:44001 ms_project] ::1:56064 ESTABLISHED","level":"debug","timestamp":"2019-10-19T20:13:32.660Z"}
{"message":"[https:44001 ms_project] ::1:56065 ESTABLISHED","level":"debug","timestamp":"2019-10-19T20:13:32.669Z"}
{"message":"[https:44001 ms_project] ::1:56064 CLOSED","level":"debug","timestamp":"2019-10-19T20:13:32.672Z"}
{"message":"[https:44001 ms_project] ::1:56065 => GET /PWA/_api/ProjectServer/Projects(%27d65f539c-347c-e711-a375-38d5477bf296%27)/includeCustomFields","level":"info","timestamp":"2019-10-19T20:13:32.695Z"}
{"message":"[https:44001 ms_project] ::1:56065 => {'requestFrom':'::1:56065','method':'GET','path':'/PWA/_api/ProjectServer/Projects(%27d65f539c-347c-e711-a375-38d5477bf296%27)/includeCustomFields','query':{},'headers':{'User-Agent':'PostmanRuntime/7.18.0','Accept':'*/*','Host':'localhost:44001','Accept-Encoding':'gzip, deflate','Connection':'keep-alive'},'body':'','ip':'::1'}","level":"debug","timestamp":"2019-10-19T20:13:32.709Z"}
{"message":"[https:44001 ms_project] using predicate match: {}","level":"debug","timestamp":"2019-10-19T20:13:32.710Z"}
{"message":"[https:44001 ms_project] generating response from {'proxy':{'to':'https://api.outer-service.com','mode':'proxyTransparent'}}","level":"debug","timestamp":"2019-10-19T20:13:32.711Z"}
{"message":"[https:44001 ms_project] Proxy ::1:56065 => {'requestFrom':'::1:56065','method':'GET','path':'/PWA/_api/ProjectServer/Projects(%27d65f539c-347c-e711-a375-38d5477bf296%27)/includeCustomFields','query':{},'headers':{'User-Agent':'PostmanRuntime/7.18.0','Accept':'*/*','Host':'localhost:44001','Accept-Encoding':'gzip, deflate','Connection':'keep-alive'},'body':'','ip':'::1'} => https://api.outer-service.com","level":"debug","timestamp":"2019-10-19T20:13:32.757Z"}
{"message":"[https:44001 ms_project] Proxy ::1:56065 <= {'statusCode':401,'headers':{'Content-Type':'text/plain; charset=utf-8','Server':'Microsoft-IIS/8.5','SPRequestGuid':'c57d0f9f-cdc2-d0d9-c3a5-2767a7a326f1','request-id':'c57d0f9f-cdc2-d0d9-c3a5-2767a7a326f1','X-FRAME-OPTIONS':'SAMEORIGIN','SPRequestDuration':'4','SPIisLatency':'1','WWW-Authenticate':'NTLM','X-Powered-By':'ASP.NET','MicrosoftSharePointTeamServices':'15.0.0.4859','X-Content-Type-Options':'nosniff','X-MS-InvokeApp':'1; RequireReadOnly','Date':'Sat, 19 Oct 2019 20:22:28 GMT','Content-Length':'16'},'body':'401 UNAUTHORIZED','_mode':'text'} <= https://api.outer-service.com","level":"debug","timestamp":"2019-10-19T20:13:33.965Z"}
{"message":"[https:44001 ms_project] ::1:56065 <= {'statusCode':401,'headers':{'Content-Type':'text/plain; charset=utf-8','Server':'Microsoft-IIS/8.5','SPRequestGuid':'c57d0f9f-cdc2-d0d9-c3a5-2767a7a326f1','request-id':'c57d0f9f-cdc2-d0d9-c3a5-2767a7a326f1','X-FRAME-OPTIONS':'SAMEORIGIN','SPRequestDuration':'4','SPIisLatency':'1','WWW-Authenticate':'NTLM','X-Powered-By':'ASP.NET','MicrosoftSharePointTeamServices':'15.0.0.4859','X-Content-Type-Options':'nosniff','X-MS-InvokeApp':'1; RequireReadOnly','Date':'Sat, 19 Oct 2019 20:22:28 GMT','Content-Length':16,'Connection':'close'},'body':'401 UNAUTHORIZED','_mode':'text'}","level":"debug","timestamp":"2019-10-19T20:13:33.969Z"}
{"message":"[https:44001 ms_project] ::1:56065 CLOSED","level":"debug","timestamp":"2019-10-19T20:13:33.974Z"}
{"message":"[https:44001 ms_project] ::1:56067 ESTABLISHED","level":"debug","timestamp":"2019-10-19T20:13:33.989Z"}
{"message":"[https:44001 ms_project] ::1:56068 ESTABLISHED","level":"debug","timestamp":"2019-10-19T20:13:33.991Z"}
{"message":"[https:44001 ms_project] ::1:56067 CLOSED","level":"debug","timestamp":"2019-10-19T20:13:33.992Z"}
{"message":"[https:44001 ms_project] ::1:56068 => GET /PWA/_api/ProjectServer/Projects(%27d65f539c-347c-e711-a375-38d5477bf296%27)/includeCustomFields","level":"info","timestamp":"2019-10-19T20:13:33.995Z"}
{"message":"[https:44001 ms_project] ::1:56068 => {'requestFrom':'::1:56068','method':'GET','path':'/PWA/_api/ProjectServer/Projects(%27d65f539c-347c-e711-a375-38d5477bf296%27)/includeCustomFields','query':{},'headers':{'User-Agent':'PostmanRuntime/7.18.0','Accept':'*/*','Host':'localhost:44001','Accept-Encoding':'gzip, deflate','Connection':'keep-alive','Authorization':'NTLM TlRMTVNTUAABAAAAB6IIogAAAAAoAAAAAAAAACgAAAAFASgKAAAADw=='},'body':'','ip':'::1'}","level":"debug","timestamp":"2019-10-19T20:13:33.999Z"}
{"message":"[https:44001 ms_project] using predicate match: {}","level":"debug","timestamp":"2019-10-19T20:13:34.000Z"}
{"message":"[https:44001 ms_project] generating response from {'proxy':{'to':'https://api.outer-service.com','mode':'proxyTransparent'}}","level":"debug","timestamp":"2019-10-19T20:13:34.002Z"}
{"message":"[https:44001 ms_project] Proxy ::1:56068 => {'requestFrom':'::1:56068','method':'GET','path':'/PWA/_api/ProjectServer/Projects(%27d65f539c-347c-e711-a375-38d5477bf296%27)/includeCustomFields','query':{},'headers':{'User-Agent':'PostmanRuntime/7.18.0','Accept':'*/*','Host':'localhost:44001','Accept-Encoding':'gzip, deflate','Connection':'keep-alive','Authorization':'NTLM TlRMTVNTUAABAAAAB6IIogAAAAAoAAAAAAAAACgAAAAFASgKAAAADw=='},'body':'','ip':'::1'} => https://api.outer-service.com","level":"debug","timestamp":"2019-10-19T20:13:34.008Z"}
{"message":"[https:44001 ms_project] Proxy ::1:56068 <= {'statusCode':401,'headers':{'Server':'Microsoft-IIS/8.5','WWW-Authenticate':'NTLM TlRMTVNTUAACAAAACAAIADgAAAAFgomiOknQCZJkLIIAAAAAAAAAAIwAjABAAAAABgOAJQAAAA9EAE0ARgBTAAIACABEAE0ARgBTAAEAGgBNAFMASwAwADEALQBWAC0AVwBFAEIAMAA0AAQADgBEAG0AZgBzAC4AcgB1AAMAKgBNAFMASwAwADEALQBWAC0AVwBFAEIAMAA0AC4AZABtAGYAcwAuAHIAdQAFAA4ARABtAGYAcwAuAHIAdQAHAAgAtXgy7rqG1QEAAAAA','SPRequestGuid':'c67d0f9f-ad1b-d0d9-c3a5-23cd2f20f48f','request-id':'c67d0f9f-ad1b-d0d9-c3a5-23cd2f20f48f','X-FRAME-OPTIONS':'SAMEORIGIN','SPRequestDuration':'1','SPIisLatency':'0','X-Powered-By':'ASP.NET','MicrosoftSharePointTeamServices':'15.0.0.4859','X-Content-Type-Options':'nosniff','X-MS-InvokeApp':'1; RequireReadOnly','Date':'Sat, 19 Oct 2019 20:22:29 GMT','Content-Length':'0'},'body':'','_mode':'text'} <= https://api.outer-service.com","level":"debug","timestamp":"2019-10-19T20:13:35.385Z"}
{"message":"[https:44001 ms_project] ::1:56068 <= {'statusCode':401,'headers':{'Server':'Microsoft-IIS/8.5','WWW-Authenticate':'NTLM TlRMTVNTUAACAAAACAAIADgAAAAFgomiOknQCZJkLIIAAAAAAAAAAIwAjABAAAAABgOAJQAAAA9EAE0ARgBTAAIACABEAE0ARgBTAAEAGgBNAFMASwAwADEALQBWAC0AVwBFAEIAMAA0AAQADgBEAG0AZgBzAC4AcgB1AAMAKgBNAFMASwAwADEALQBWAC0AVwBFAEIAMAA0AC4AZABtAGYAcwAuAHIAdQAFAA4ARABtAGYAcwAuAHIAdQAHAAgAtXgy7rqG1QEAAAAA','SPRequestGuid':'c67d0f9f-ad1b-d0d9-c3a5-23cd2f20f48f','request-id':'c67d0f9f-ad1b-d0d9-c3a5-23cd2f20f48f','X-FRAME-OPTIONS':'SAMEORIGIN','SPRequestDuration':'1','SPIisLatency':'0','X-Powered-By':'ASP.NET','MicrosoftSharePointTeamServices':'15.0.0.4859','X-Content-Type-Options':'nosniff','X-MS-InvokeApp':'1; RequireReadOnly','Date':'Sat, 19 Oct 2019 20:22:29 GMT','Content-Length':0,'Connection':'close'},'body':'','_mode':'text'}","level":"debug","timestamp":"2019-10-19T20:13:35.413Z"}
{"message":"[https:44001 ms_project] ::1:56068 CLOSED","level":"debug","timestamp":"2019-10-19T20:13:35.420Z"}
{"message":"[https:44001 ms_project] ::1:56070 ESTABLISHED","level":"debug","timestamp":"2019-10-19T20:13:35.422Z"}
{"message":"[https:44001 ms_project] ::1:56071 ESTABLISHED","level":"debug","timestamp":"2019-10-19T20:13:35.424Z"}
{"message":"[https:44001 ms_project] ::1:56070 CLOSED","level":"debug","timestamp":"2019-10-19T20:13:35.426Z"}
{"message":"[https:44001 ms_project] ::1:56071 => GET /PWA/_api/ProjectServer/Projects(%27d65f539c-347c-e711-a375-38d5477bf296%27)/includeCustomFields","level":"info","timestamp":"2019-10-19T20:13:35.429Z"}
{"message":"[https:44001 ms_project] ::1:56071 => {'requestFrom':'::1:56071','method':'GET','path':'/PWA/_api/ProjectServer/Projects(%27d65f539c-347c-e711-a375-38d5477bf296%27)/includeCustomFields','query':{},'headers':{'User-Agent':'PostmanRuntime/7.18.0','Accept':'*/*','Host':'localhost:44001','Accept-Encoding':'gzip, deflate','Connection':'keep-alive','Authorization':'NTLM TlRMTVNTUAADAAAAGAAYAGgAAAAYABgAgAAAAAAAAABIAAAAIAAgAEgAAAAAAAAAaAAAAAAAAACYAAAABYKIogUBKAoAAAAPbQBzAGsAMAAxAC0AYQBzAC0AaQBzAHUAcABfAHAAcwChXckKKObIAgAAAAAAAAAAAAAAAAAAAAC7J28tpUODuPWVM46z4l6jNCxcZTO/IfU='},'body':'','ip':'::1'}","level":"debug","timestamp":"2019-10-19T20:13:35.433Z"}
{"message":"[https:44001 ms_project] using predicate match: {}","level":"debug","timestamp":"2019-10-19T20:13:35.434Z"}
{"message":"[https:44001 ms_project] generating response from {'proxy':{'to':'https://api.outer-service.com','mode':'proxyTransparent'}}","level":"debug","timestamp":"2019-10-19T20:13:35.435Z"}
{"message":"[https:44001 ms_project] Proxy ::1:56071 => {'requestFrom':'::1:56071','method':'GET','path':'/PWA/_api/ProjectServer/Projects(%27d65f539c-347c-e711-a375-38d5477bf296%27)/includeCustomFields','query':{},'headers':{'User-Agent':'PostmanRuntime/7.18.0','Accept':'*/*','Host':'localhost:44001','Accept-Encoding':'gzip, deflate','Connection':'keep-alive','Authorization':'NTLM TlRMTVNTUAADAAAAGAAYAGgAAAAYABgAgAAAAAAAAABIAAAAIAAgAEgAAAAAAAAAaAAAAAAAAACYAAAABYKIogUBKAoAAAAPbQBzAGsAMAAxAC0AYQBzAC0AaQBzAHUAcABfAHAAcwChXckKKObIAgAAAAAAAAAAAAAAAAAAAAC7J28tpUODuPWVM46z4l6jNCxcZTO/IfU='},'body':'','ip':'::1'} => https://api.outer-service.com","level":"debug","timestamp":"2019-10-19T20:13:35.441Z"}
{"message":"[https:44001 ms_project] Proxy ::1:56071 <= {'statusCode':401,'headers':{'Server':'Microsoft-IIS/8.5','SPRequestGuid':'c67d0f9f-6d25-d0d9-c3a5-2018e00fb5af','request-id':'c67d0f9f-6d25-d0d9-c3a5-2018e00fb5af','X-FRAME-OPTIONS':'SAMEORIGIN','SPRequestDuration':'1','SPIisLatency':'0','WWW-Authenticate':'NTLM','X-Powered-By':'ASP.NET','MicrosoftSharePointTeamServices':'15.0.0.4859','X-Content-Type-Options':'nosniff','X-MS-InvokeApp':'1; RequireReadOnly','Date':'Sat, 19 Oct 2019 20:22:29 GMT','Content-Length':'0'},'body':'','_mode':'text'} <= https://api.outer-service.com","level":"debug","timestamp":"2019-10-19T20:13:35.541Z"}
{"message":"[https:44001 ms_project] ::1:56071 <= {'statusCode':401,'headers':{'Server':'Microsoft-IIS/8.5','SPRequestGuid':'c67d0f9f-6d25-d0d9-c3a5-2018e00fb5af','request-id':'c67d0f9f-6d25-d0d9-c3a5-2018e00fb5af','X-FRAME-OPTIONS':'SAMEORIGIN','SPRequestDuration':'1','SPIisLatency':'0','WWW-Authenticate':'NTLM','X-Powered-By':'ASP.NET','MicrosoftSharePointTeamServices':'15.0.0.4859','X-Content-Type-Options':'nosniff','X-MS-InvokeApp':'1; RequireReadOnly','Date':'Sat, 19 Oct 2019 20:22:29 GMT','Content-Length':0,'Connection':'close'},'body':'','_mode':'text'}","level":"debug","timestamp":"2019-10-19T20:13:35.557Z"}
{"message":"[https:44001 ms_project] ::1:56071 CLOSED","level":"debug","timestamp":"2019-10-19T20:13:35.560Z"}