diff --git a/lib/setopt.c b/lib/setopt.c
index e832ef1afd..22d32b64a4 100644
--- a/lib/setopt.c
+++ b/lib/setopt.c
@@ -49,6 +49,7 @@
#include "curlx/strdup.h"
#include "escape.h"
#include "bufref.h"
+#include "vauth/vauth.h"
static CURLcode setopt_set_timeout_sec(timediff_t *ptimeout_ms, long secs)
{
@@ -1622,6 +1623,20 @@ static CURLcode cookiefile(struct Curl_easy *data, const char *ptr)
#endif
#ifndef CURL_DISABLE_PROXY
+
+static CURLcode setproxy(struct Curl_easy *data, const char *proxy)
+{
+ if((data->set.str[STRING_PROXY] && proxy) &&
+ /* there was one set, is this a new one? */
+ !strcmp(data->set.str[STRING_PROXY], proxy))
+ return CURLE_OK; /* same one as before */
+
+ Curl_auth_digest_cleanup(&data->state.proxydigest);
+ memset(&data->state.authproxy, 0, sizeof(data->state.authproxy));
+ return Curl_setstropt(&data->set.str[STRING_PROXY], proxy);
+}
+
+
static CURLcode setopt_cptr_proxy(struct Curl_easy *data, CURLoption option,
const char *ptr)
{
@@ -1717,7 +1732,7 @@ static CURLcode setopt_cptr_proxy(struct Curl_easy *data, CURLoption option,
* Setting it to NULL, means no proxy but allows the environment variables
* to decide for us (if CURLOPT_PRE_PROXY setting it to NULL).
*/
- return Curl_setstropt(&s->str[STRING_PROXY], ptr);
+ return setproxy(data, ptr);
case CURLOPT_PRE_PROXY:
/*
* Set proxy server:port to use as SOCKS proxy.
diff --git a/lib/vauth/vauth.h b/lib/vauth/vauth.h
index b5ff31414f..279da60be2 100644
--- a/lib/vauth/vauth.h
+++ b/lib/vauth/vauth.h
@@ -117,6 +117,7 @@ CURLcode Curl_auth_create_digest_http_message(struct Curl_easy *data,
/* This is used to clean up the digest specific data */
void Curl_auth_digest_cleanup(struct digestdata *digest);
#else
+#define Curl_auth_digest_cleanup(x)
#define Curl_auth_is_digest_supported() FALSE
#endif /* !CURL_DISABLE_DIGEST_AUTH */
diff --git a/tests/data/Makefile.am b/tests/data/Makefile.am
index dc0d8311ec..00d3e4166e 100644
--- a/tests/data/Makefile.am
+++ b/tests/data/Makefile.am
@@ -209,6 +209,7 @@ test1556 test1557 test1558 test1559 test1560 test1561 test1562 test1563 \
test1564 test1565 test1566 test1567 test1568 test1569 test1570 test1571 \
test1572 test1573 test1574 test1575 test1576 test1577 test1578 test1579 \
test1580 test1581 test1582 test1583 test1584 test1585 test1586 test1587 \
+test1588 \
\
test1590 test1591 test1592 test1593 test1594 test1595 test1596 test1597 \
test1598 test1599 test1600 test1601 test1602 test1603 test1604 test1605 \
diff --git a/tests/data/test1588 b/tests/data/test1588
new file mode 100644
index 0000000000..753e98cd6b
--- /dev/null
+++ b/tests/data/test1588
@@ -0,0 +1,106 @@
+
+
+
+
+HTTP
+HTTP GET
+HTTP proxy
+HTTP proxy Digest auth
+multi
+
+
+
+# Server-side
+
+
+# this is returned first since we get no proxy-auth
+
+HTTP/1.1 407 Authorization Required to proxy me my dear
+Proxy-Authenticate: Digest realm="weirdorealm", nonce="12345"
+Content-Length: 33
+
+And you should ignore this data.
+
+
+# then this is returned when we get proxy-auth
+
+HTTP/1.1 200 OK
+Content-Length: 21
+Server: no
+
+Nice proxy auth sir!
+
+
+
+HTTP/1.1 407 Authorization Required to proxy me my dear
+Proxy-Authenticate: Digest realm="weirdorealm", nonce="12345"
+Content-Length: 33
+
+HTTP/1.1 200 OK
+Content-Length: 21
+Server: no
+
+Nice proxy auth sir!
+HTTP/1.1 407 Authorization Required to proxy me my dear
+Proxy-Authenticate: Digest realm="weirdorealm", nonce="12345"
+Content-Length: 33
+
+HTTP/1.1 200 OK
+Content-Length: 21
+Server: no
+
+Nice proxy auth sir!
+
+
+
+# Client-side
+
+
+http
+
+# tool is what to use instead of 'curl'
+
+lib%TESTNUMBER
+
+
+!SSPI
+crypto
+proxy
+digest
+
+
+HTTP proxy auth Digest, then change proxy and do it again
+
+
+http://test.remote.example.com/path/%TESTNUMBER %HOSTIP %HTTPPORT silly:person custom.set.host.name
+
+
+
+# Verify data after the test has been "shot"
+
+
+GET http://test.remote.example.com/path/1588 HTTP/1.1
+Host: test.remote.example.com
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+GET http://test.remote.example.com/path/1588 HTTP/1.1
+Host: test.remote.example.com
+Proxy-Authorization: Digest username="silly", realm="weirdorealm", nonce="12345", uri="/path/1588", response="d0b2f000c7e3fca24452b5810713404a"
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+GET http://test.remote.example.com/path/1588 HTTP/1.1
+Host: test.remote.example.com
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+GET http://test.remote.example.com/path/1588 HTTP/1.1
+Host: test.remote.example.com
+Proxy-Authorization: Digest username="silly", realm="weirdorealm", nonce="12345", uri="/path/1588", response="d0b2f000c7e3fca24452b5810713404a"
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+
+
+
diff --git a/tests/libtest/Makefile.inc b/tests/libtest/Makefile.inc
index 10be282c17..724636464a 100644
--- a/tests/libtest/Makefile.inc
+++ b/tests/libtest/Makefile.inc
@@ -96,7 +96,7 @@ TESTS_C = \
lib1552.c lib1553.c lib1554.c lib1555.c lib1556.c lib1557.c lib1558.c \
lib1559.c lib1560.c lib1564.c lib1565.c \
lib1567.c lib1568.c lib1569.c lib1571.c \
- lib1576.c lib1582.c lib1587.c \
+ lib1576.c lib1582.c lib1587.c lib1588.c \
lib1591.c lib1592.c lib1593.c lib1594.c lib1597.c \
lib1598.c lib1599.c \
lib1662.c \
diff --git a/tests/libtest/lib1588.c b/tests/libtest/lib1588.c
new file mode 100644
index 0000000000..9b12f36bfe
--- /dev/null
+++ b/tests/libtest/lib1588.c
@@ -0,0 +1,150 @@
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, , et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+/*
+ * argv1 = URL
+ * argv2 = proxy host
+ * argv3 = proxy port
+ * argv4 = proxyuser:password
+ */
+
+#include "first.h"
+
+static CURLcode init1588(CURL *curl, const char *url,
+ const char *userpwd, const char *proxy)
+{
+ CURLcode result = CURLE_OK;
+
+ res_easy_setopt(curl, CURLOPT_URL, url);
+ if(result)
+ goto init_failed;
+
+ res_easy_setopt(curl, CURLOPT_PROXY, proxy);
+ if(result)
+ goto init_failed;
+
+ res_easy_setopt(curl, CURLOPT_PROXYUSERPWD, userpwd);
+ if(result)
+ goto init_failed;
+
+ res_easy_setopt(curl, CURLOPT_PROXYAUTH, CURLAUTH_DIGEST);
+ if(result)
+ goto init_failed;
+
+ res_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
+ if(result)
+ goto init_failed;
+#if 0
+ res_easy_setopt(curl, CURLOPT_HTTPPROXYTUNNEL, 1L);
+ if(result)
+ goto init_failed;
+#endif
+
+ res_easy_setopt(curl, CURLOPT_HEADER, 1L);
+ if(result)
+ goto init_failed;
+
+ return CURLE_OK; /* success */
+
+init_failed:
+ return result; /* failure */
+}
+
+static CURLcode run1588(CURL *curl, const char *url, const char *userpwd,
+ const char *proxy)
+{
+ CURLcode result = CURLE_OK;
+
+ result = init1588(curl, url, userpwd, proxy);
+ if(result)
+ return result;
+
+ return curl_easy_perform(curl);
+}
+
+static CURLcode test_lib1588(const char *URL)
+{
+ CURLcode result = CURLE_OK;
+ CURL *curl = NULL;
+ const char *proxyuserpws = libtest_arg4;
+ struct curl_slist *host = NULL;
+ struct curl_slist *host2 = NULL;
+ char proxy1_resolve[128];
+ char proxy2_resolve[128];
+ char proxy1_connect[128];
+ char proxy2_connect[128];
+
+ if(test_argc < 3)
+ return TEST_ERR_MAJOR_BAD;
+
+ curl_msnprintf(proxy1_resolve, sizeof(proxy1_resolve),
+ "firstproxy:%s:%s", libtest_arg3, libtest_arg2);
+ curl_msnprintf(proxy2_resolve, sizeof(proxy2_resolve),
+ "secondproxy:%s:%s", libtest_arg3, libtest_arg2);
+
+ /* we connect to the fake host name but the right port number */
+ curl_msnprintf(proxy1_connect, sizeof(proxy1_connect),
+ "firstproxy:%s", libtest_arg3);
+ curl_msnprintf(proxy2_connect, sizeof(proxy2_connect),
+ "secondproxy:%s", libtest_arg3);
+
+ res_global_init(CURL_GLOBAL_ALL);
+ if(result)
+ return result;
+
+ curl = curl_easy_init();
+ if(!curl) {
+ curl_mfprintf(stderr, "curl_easy_init() failed\n");
+ curl_global_cleanup();
+ return TEST_ERR_MAJOR_BAD;
+ }
+
+ host = curl_slist_append(NULL, proxy1_resolve);
+ if(!host)
+ goto test_cleanup;
+ host2 = curl_slist_append(host, proxy2_resolve);
+ if(!host2)
+ goto test_cleanup;
+ host = host2;
+
+ start_test_timing();
+
+ easy_setopt(curl, CURLOPT_RESOLVE, host);
+
+ result = run1588(curl, URL, proxyuserpws, proxy1_connect);
+ if(result)
+ goto test_cleanup;
+
+ curl_mfprintf(stderr, "lib1588: now we do the request again\n");
+
+ result = run1588(curl, URL, proxyuserpws, proxy2_connect);
+
+test_cleanup:
+
+ /* proper cleanup sequence - type PB */
+
+ curl_easy_cleanup(curl);
+ curl_global_cleanup();
+ curl_slist_free_all(host);
+ return result;
+}