- Bug report #1973352 (http://curl.haxx.se/bug/view.cgi?id=1973352) identified

how the HTTP redirect following code didn't properly follow to a new URL if
  the new url was but a query string such as "Location: ?moo=foo". Test case
  1031 was added to verify this fix.

CHANGES

@@ -8,6 +8,11 @@
 
 
 Daniel Stenberg (26 May 2008)
+- Bug report #1973352 (http://curl.haxx.se/bug/view.cgi?id=1973352) identified
+  how the HTTP redirect following code didn't properly follow to a new URL if
+  the new url was but a query string such as "Location: ?moo=foo". Test case
+  1031 was added to verify this fix.
+
 - Andreas Faerber and Scott McCreary made (lib)curl build for the Haiku OS. 
 
 Yang Tse (26 May 2008)

RELEASE-NOTES

@@ -37,6 +37,7 @@ This release includes the following bugfixes:
  o internal time differences now use monotonic time source if available
  o several curl_multi_socket() fixes
  o builds fine for Haiku OS
+ o follow redirect with only a new query string
 
 This release includes the following known bugs:
 

lib/transfer.c

@@ -2044,14 +2044,18 @@ CURLcode Curl_follow(struct SessionHandle *data,
       if(pathsep)
         *pathsep=0;
 
-      /* we have a relative path to append to the last slash if
-         there's one available */
-      pathsep = strrchr(protsep, '/');
-      if(pathsep)
-        *pathsep=0;
+      /* we have a relative path to append to the last slash if there's one
+         available, or if the new URL is just a query string (starts with a
+         '?')  we append the new one at the end of the entire currently worked
+         out URL */
+      if(useurl[0] != '?') {
+        pathsep = strrchr(protsep, '/');
+        if(pathsep)
+          *pathsep=0;
+      }
 
-      /* Check if there's any slash after the host name, and if so,
-         remember that position instead */
+      /* Check if there's any slash after the host name, and if so, remember
+         that position instead */
       pathsep = strchr(protsep, '/');
       if(pathsep)
         protsep = pathsep+1;
@@ -2129,7 +2133,7 @@ CURLcode Curl_follow(struct SessionHandle *data,
     memcpy(newest, url_clone, urllen);
 
     /* check if we need to append a slash */
-    if(('/' == useurl[0]) || (protsep && !*protsep))
+    if(('/' == useurl[0]) || (protsep && !*protsep) || ('?' == useurl[0]))
       ;
     else
       newest[urllen++]='/';

tests/data/Makefile.am

@@ -51,7 +51,7 @@ EXTRA_DIST = test1 test108 test117 test127 test20 test27 test34 test46	   \
  test1021 test1022 test1023 test309 test616 test617 test618 test619        \
  test620 test621 test622 test623 test624 test625 test626 test627 test554   \
  test1024 test1025 test555 test1026 test1027 test1028 test1029 test1030    \
- test556
+ test556 test1031
 
 filecheck:
 	@mkdir test-place; \

tests/data/test1031

@@ -0,0 +1,76 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+followlocation
+</keywords>
+</info>
+# Server-side
+<reply>
+<data>
+HTTP/1.1 301 This is a weirdo text message swsclose
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Location: ?coolsite=yes/10310002.txt
+Connection: close
+
+This server reply is for testing a simple Location: following
+
+</data>
+<data2>
+HTTP/1.1 200 Followed here fine swsclose
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 52
+
+If this is received, the location following worked
+
+</data2>
+<datacheck>
+HTTP/1.1 301 This is a weirdo text message swsclose
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Location: ?coolsite=yes/10310002.txt
+Connection: close
+
+HTTP/1.1 200 Followed here fine swsclose
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 52
+
+If this is received, the location following worked
+
+</datacheck>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+ <name>
+HTTP Location: following to a query string
+ </name>
+ <command>
+http://%HOSTIP:%HTTPPORT/want/this/1031 -L
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET /want/this/1031 HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Accept: */*
+
+GET /want/this/1031?coolsite=yes/10310002.txt HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Accept: */*
+
+</protocol>
+</verify>
+</testcase>