http: clear credentials better on redirect

Verify with test 2506: netrc with redirect using proxy

Updated test 998 which was wrong.

Reported-by: Muhamad Arga Reksapati

Closes #21345

tests/data/Makefile.am

@@ -265,7 +265,7 @@ test2309 \
 \
 test2400 test2401 test2402 test2403 test2404 test2405 test2406 test2407 \
 \
-test2500 test2501 test2502 test2503 test2504 test2505 \
+test2500 test2501 test2502 test2503 test2504 test2505 test2506 \
 \
 test2600 test2601 test2602 test2603 test2604 test2605 \
 \

tests/data/test2506

@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="US-ASCII"?>
+<testcase>
+<info>
+<keywords>
+HTTP
+cookies
+</keywords>
+</info>
+
+<reply>
+<data crlf="headers" nocheck="yes">
+HTTP/1.1 301 redirect
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Content-Length: 3
+Location: http://numbertwo.example/%TESTNUMBER0002
+
+ok
+</data>
+<data2 crlf="headers" nocheck="yes">
+HTTP/1.1 200 OK
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Content-Length: 4
+
+yes
+</data2>
+</reply>
+
+<client>
+<server>
+http
+</server>
+<features>
+proxy
+</features>
+<tool>
+lib%TESTNUMBER
+</tool>
+<name>
+netrc with redirect using proxy
+</name>
+<file name="%LOGDIR/netrc2506">
+machine site.example login batman password robin
+</file>
+<command>
+http://%HOSTIP:%HTTPPORT http://site.example/ %LOGDIR/netrc2506
+</command>
+</client>
+
+<verify>
+<protocol crlf="headers">
+GET http://site.example/ HTTP/1.1
+Host: site.example
+Authorization: Basic %b64[batman:robin]b64%
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+GET http://numbertwo.example/25060002 HTTP/1.1
+Host: numbertwo.example
+Accept: */*
+Proxy-Connection: Keep-Alive
+
+</protocol>
+</verify>
+</testcase>

tests/data/test998

@@ -77,7 +77,6 @@ Proxy-Connection: Keep-Alive
 
 GET http://somewhere.else.example/a/path/9980002 HTTP/1.1
 Host: somewhere.else.example
-Authorization: Basic %b64[alberto:einstein]b64%
 User-Agent: curl/%VERSION
 Accept: */*
 Proxy-Connection: Keep-Alive