TE: do the Connection: header

When TE: is inserted in the request, we must add a "Connection: TE" as
well to be HTTP 1.1 compliant. If a custom Connection: header is passed
in, we must use that and only append TE to it. Test case 1125 verifies
TE: + custom Connection:.

lib/http.c

@@ -1533,6 +1533,11 @@ CURLcode Curl_add_custom_headers(struct connectdata *conn,
                    we will force length zero then */
                 checkprefix("Content-Length", headers->data))
           ;
+        else if(conn->allocptr.te &&
+                /* when asking for Transfer-Encoding, don't pass on a custom
+                   Connection: */
+                checkprefix("Connection", headers->data))
+          ;
         else {
           CURLcode result = Curl_add_bufferf(req_buffer, "%s\r\n",
                                              headers->data);
@@ -1728,14 +1733,21 @@ CURLcode Curl_http(struct connectdata *conn, bool *done)
       return CURLE_OUT_OF_MEMORY;
   }
 
-#if 0
-  if(!Curl_checkheaders(data, "TE:")) {
+  if(Curl_checkheaders(data, "TE:")) {
+    /* When we insert a TE: header in the request, we must also insert TE in a
+       Connection: header, so we need to merge the custom provided Connection:
+       header and prevent the original to get sent */
+    char *cptr = Curl_checkheaders(data, "Connection:");
+
     Curl_safefree(conn->allocptr.te);
-    conn->allocptr.te = aprintf("TE: %s\r\n", "gzip");
+
+    /* Create the (updated) Connection: header */
+    conn->allocptr.te = cptr? aprintf("%s, TE\r\n", cptr):
+      strdup("Connection: TE\r\n");
+
     if(!conn->allocptr.te)
       return CURLE_OUT_OF_MEMORY;
   }
-#endif
 
   ptr = Curl_checkheaders(data, "Transfer-Encoding:");
   if(ptr) {

tests/data/Makefile.am

@@ -71,7 +71,7 @@ EXTRA_DIST = test1 test108 test117 test127 test20 test27 test34 test46	   \
  test1203 test1117 test1118 test1119 test1120 test1300 test1301 test1302 \
  test1303 test320 test321 test322 test323 test324 test1121 test581 test580 \
  test1304 test1305 test1306 test1307 test582 test583 test808 test809       \
- test810 test811 test812 test813 test584 test1122 test1123 test1124
+ test810 test811 test812 test813 test584 test1122 test1123 test1124 test1125
 
 filecheck:
 	@mkdir test-place; \

tests/data/test1122

@@ -62,6 +62,7 @@ http://%HOSTIP:%HTTPPORT/1122 -H "TE: gzip"
 GET /1122 HTTP/1.1
 Host: %HOSTIP:%HTTPPORT
 Accept: */*
+Connection: TE
 TE: gzip
 
 </protocol>

tests/data/test1123

@@ -192,6 +192,7 @@ http://%HOSTIP:%HTTPPORT/1123 -H "TE: deflate, gzip"
 GET /1123 HTTP/1.1
 Host: %HOSTIP:%HTTPPORT
 Accept: */*
+Connection: TE
 TE: deflate, gzip
 
 </protocol>

tests/data/test1124

@@ -61,6 +61,7 @@ http://%HOSTIP:%HTTPPORT/1124 -H "TE: gzip"
 GET /1124 HTTP/1.1
 Host: %HOSTIP:%HTTPPORT
 Accept: */*
+Connection: TE
 TE: gzip
 
 </protocol>

tests/data/test1125

@@ -0,0 +1,70 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+compressed
+Transfer-Encoding
+</keywords>
+</info>
+#
+# Server-side
+<reply>
+<data base64="yes">
+SFRUUC8xLjEgMjAwIE9LDQpEYXRlOiBNb24sIDI5IE5vdiAyMDA0IDIxOjU2OjUzIEdNVA0KU2Vy
+dmVyOiBBcGFjaGUvMS4zLjMxIChEZWJpYW4gR05VL0xpbnV4KSBtb2RfZ3ppcC8xLjMuMjYuMWEg
+UEhQLzQuMy45LTEgbW9kX3NzbC8yLjguMjAgT3BlblNTTC8wLjkuN2QgbW9kX3BlcmwvMS4yOQ0K
+VmFyeTogQWNjZXB0LUVuY29kaW5nDQpDb250ZW50LVR5cGU6IHRleHQvaHRtbDsgY2hhcnNldD1J
+U08tODg1OS0xDQpUcmFuc2Zlci1FbmNvZGluZzogZ3ppcA0KQ29udGVudC1MZW5ndGg6IDQ0DQoN
+Ch+LCAh5nqtBAANsYWxhbGEAy8nMS1Uw5FLIAdFGXAoQhjEXAAoCcWAYAAAA
+</data>
+
+<datacheck>
+HTTP/1.1 200 OK
+Date: Mon, 29 Nov 2004 21:56:53 GMT
+Server: Apache/1.3.31 (Debian GNU/Linux) mod_gzip/1.3.26.1a PHP/4.3.9-1 mod_ssl/2.8.20 OpenSSL/0.9.7d mod_perl/1.29
+Vary: Accept-Encoding
+Content-Type: text/html; charset=ISO-8859-1
+Transfer-Encoding: gzip
+Content-Length: 44
+
+line 1
+ line 2
+  line 3
+</datacheck>
+
+</reply>
+
+#
+# Client-side
+<client>
+<features>
+libz
+</features>
+<server>
+http
+</server>
+ <name>
+HTTP GET transfer-encoding with custom Connection:
+ </name>
+ <command>
+http://%HOSTIP:%HTTPPORT/1125 -H "TE: gzip" -H "Connection: close"
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET /1125 HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Accept: */*
+Connection: close, TE
+TE: gzip
+
+</protocol>
+</verify>
+</testcase>