diff --git a/lib/url.c b/lib/url.c
index d15cdc1027..471399123a 100644
--- a/lib/url.c
+++ b/lib/url.c
@@ -106,6 +106,7 @@
 #include "telnet.h"
 #include "tftp.h"
 #include "http.h"
+#include "vauth/vauth.h"
 #include "file.h"
 #include "curl_ldap.h"
 #include "vssh/ssh.h"
@@ -1437,8 +1438,7 @@ static CURLcode url_set_data_creds(struct Curl_easy *data,
       data->set.str[STRING_BEARER] ||
       data->set.str[STRING_SASL_AUTHZID] ||
       data->set.str[STRING_SERVICE_NAME]) &&
-     (data->set.allow_auth_to_other_hosts ||
-      Curl_peer_same_destination(data->state.initial_origin, conn->origin))) {
+     Curl_auth_allowed_to_origin(data, conn->origin)) {
     result = Curl_creds_create(data->set.str[STRING_USERNAME],
                                data->set.str[STRING_PASSWORD],
                                data->set.str[STRING_BEARER],
diff --git a/lib/vauth/vauth.c b/lib/vauth/vauth.c
index 76de85cb28..1bd3575af9 100644
--- a/lib/vauth/vauth.c
+++ b/lib/vauth/vauth.c
@@ -138,9 +138,15 @@ bool Curl_auth_user_contains_domain(struct Curl_creds *creds)
  * "sensitive data" can be sent to the connection's origin.
  */
 bool Curl_auth_allowed_to_host(struct Curl_easy *data)
+{
+  return Curl_auth_allowed_to_origin(data, data->conn->origin);
+}
+
+bool Curl_auth_allowed_to_origin(struct Curl_easy *data,
+                                 struct Curl_peer *origin)
 {
   return data->set.allow_auth_to_other_hosts ||
-         Curl_peer_equal(data->state.initial_origin, data->conn->origin);
+         Curl_peer_equal(data->state.initial_origin, origin);
 }
 
 #ifdef USE_NTLM
diff --git a/lib/vauth/vauth.h b/lib/vauth/vauth.h
index 3bbecb8896..c21b349571 100644
--- a/lib/vauth/vauth.h
+++ b/lib/vauth/vauth.h
@@ -32,6 +32,7 @@
 struct Curl_easy;
 struct Curl_creds;
 struct connectdata;
+struct Curl_peer;
 
 #ifndef CURL_DISABLE_DIGEST_AUTH
 struct digestdata;
@@ -59,6 +60,8 @@ struct gsasldata;
  * "sensitive data" can (still) be sent to this host.
  */
 bool Curl_auth_allowed_to_host(struct Curl_easy *data);
+bool Curl_auth_allowed_to_origin(struct Curl_easy *data,
+                                 struct Curl_peer *origin);
 
 /* This is used to build an SPN string */
 #ifndef USE_WINDOWS_SSPI
diff --git a/tests/data/Makefile.am b/tests/data/Makefile.am
index bd3f0d01b0..166de82cf7 100644
--- a/tests/data/Makefile.am
+++ b/tests/data/Makefile.am
@@ -282,7 +282,7 @@ test3016 test3017 test3018 test3019 test3020 test3021 test3022 test3023 \
 test3024 test3025 test3026 test3027 test3028 test3029 test3030 test3031 \
 test3032 test3033 test3034 test3035 test3036 \
 \
-test3100 test3101 test3102 test3103 test3104 test3105 \
+test3100 test3101 test3102 test3103 test3104 test3105 test3106 \
 \
 test3200 test3201 test3202 test3203 test3204 test3205 test3206 test3207 \
 test3208 test3209 test3210 test3211 test3212 test3213 test3214 test3215 \
diff --git a/tests/data/test3106 b/tests/data/test3106
new file mode 100644
index 0000000000..971107e0fa
--- /dev/null
+++ b/tests/data/test3106
@@ -0,0 +1,77 @@
+<?xml version="1.0" encoding="US-ASCII"?>
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTPS
+HTTP proxy
+HTTP Basic auth
+followlocation
+</keywords>
+</info>
+
+# Server-side
+<reply>
+<connect crlf="headers">
+HTTP/1.1 200 OK
+
+</connect>
+
+<data crlf="headers" nocheck="yes">
+HTTP/1.1 302 Found
+Location: http://example.com:%HTTPSPORT/%TESTNUMBER0002
+Content-Length: 0
+
+</data>
+
+<data2 crlf="headers">
+HTTP/1.1 200 OK
+Content-Length: 2
+
+OK
+</data2>
+</reply>
+
+# Client-side
+<client>
+<features>
+SSL
+proxy
+</features>
+<server>
+https
+http-proxy
+</server>
+<name>
+HTTPS to HTTP redirect on same host and port without auth
+</name>
+<command>
+--insecure --location --user user:secret --proxy %HOSTIP:%PROXYPORT https://example.com:%HTTPSPORT/%TESTNUMBER
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<proxy crlf="headers">
+CONNECT example.com:%HTTPSPORT HTTP/1.1
+Host: example.com:%HTTPSPORT
+User-Agent: curl/%VERSION
+Proxy-Connection: Keep-Alive
+
+GET http://example.com:%HTTPSPORT/%TESTNUMBER0002 HTTP/1.1
+Host: example.com:%HTTPSPORT
+User-Agent: curl/%VERSION
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+</proxy>
+<protocol crlf="headers">
+GET /%TESTNUMBER HTTP/1.1
+Host: example.com:%HTTPSPORT
+Authorization: Basic %b64[user:secret]b64%
+User-Agent: curl/%VERSION
+Accept: */*
+
+</protocol>
+</verify>
+</testcase>