Curl_follow: extract the Location: header field unvalidated

... when not actually following the redirect. Otherwise we return error
for this and an application can't extract the value.

Test 1518 added to verify.

Reported-by: Pavel Pavlov
Fixes #3340
Closes #3364

2 files changed, 63 insertions, 1 deletions

diff --git a/tests/data/Makefile.inc b/tests/data/Makefile.inc
index 5c202a3fe..f6cdea83e 100644
--- a/tests/data/Makefile.inc
+++ b/tests/data/Makefile.inc
@@ -169,7 +169,7 @@ test1444 test1445 test1446 test1447 test1448 test1449 test1450 test1451 \
 test1452 test1453 test1454 test1455 test1456 test1457 \
 test1500 test1501 test1502 test1503 test1504 test1505 test1506 test1507 \
 test1508 test1509 test1510 test1511 test1512 test1513 test1514 test1515 \
-test1516 test1517 \
+test1516 test1517 test1518 \
 \
 test1520 test1521 test1522 \
 \
diff --git a/tests/data/test1518 b/tests/data/test1518
new file mode 100644
index 000000000..134ea4af6
--- /dev/null
+++ b/tests/data/test1518
@@ -0,0 +1,62 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+</keywords>
+</info>
+#
+# This reproduces issue #3340
+#
+# Server-side
+<reply>
+<data nocheck="yes">
+HTTP/1.1 302 redirect to broken URL
+Date: Thu, 17 Mar 2016 14:41:00 GMT
+Server: test-server/fake
+Content-Type: text/plain; charset=US-ASCII
+X-Special: swsclose
+Location: http://1.2 .4.5/test
+Content-Length: 0
+Connection: close
+
+</data>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+# tool is what to use instead of 'curl'
+<tool>
+lib1518
+</tool>
+
+ <name>
+Extract Location: with broken URL
+ </name>
+ <command>
+http://%HOSTIP:%HTTPPORT/1518
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<strippart>
+
+</strippart>
+<protocol>
+</protocol>
+<stdout>
+res: 0
+status: 302
+redirects: 0
+effectiveurl: http://%HOSTIP:%HTTPPORT/1518
+redirecturl: http://1.2 .4.5/test
+</stdout>
+<errorcode>
+0
+</errorcode>
+</verify>
+</testcase>