Http data server changes

* Indirect redirects from directory to `index.html`
  * Added `HTTP_DATA_INTERNAL_REDIRECT` compile-time option
* Added CLICON_RESTCONF_API_ROOT to clixon-config.yang
* Added 404 return without body if neither restconf, data or streams prefix match
* Fixed: HTTP/1 parse error for '/' path

CHANGELOG.md

@@ -40,20 +40,19 @@ Expected: May 2022
 ### New features
 
 * Extended the Restconf implementation with a limited http-data static service
-  * Added two new config options to clixon-config.yang:
-     * `CLICON_HTTP_DATA_PATH`
-     * `CLICON_HTTP_DATA_ROOT`
-  * Added feature http-data to restconf-config.yang and the following option:
-     * `enable-http-data`
    * The limited implementation is as follows:
       * path: Local static files within `CLICON_WWW_DATA_ROOT`
       * operation GET, HEAD, or OPTIONS
       * query parameters not supported
       * no indata
-        * media: html, css, js, fonts, image, 
+      * media: html, css, js, fonts, image.
-  7. Authentication, TLS, http/2 as restconf
+      * authentication, TLS, http/2 as restconf
-Generic changes:
+   * Added two new config options to clixon-config.yang:
-  * Uniform path selection across fcgi, native http/1 + http/2
+      * `CLICON_HTTP_DATA_PATH`
+      * `CLICON_HTTP_DATA_ROOT`
+   * Added feature http-data to restconf-config.yang and the following option that needs to be true
+      * `enable-http-data`
+   * Added `HTTP_DATA_INTERNAL_REDIRECT` compile-time option for internal redirects to `index.html`
 
 * Implementation of "chunked framing" according to RFC6242 for Netconf 1.1.
   * First hello is 1.0 EOM framing, then successing rpc is chunked framing
@@ -65,10 +64,13 @@ Generic changes:
 
 Users may have to change how they access the system
 
+* Restconf
+    * Added 404 return without body if neither restconf, data or streams prefix match
 * Netconf: Usage of chunked framing"
     * To keep existing end-of-message encoding, set `CLICON_NETCONF_BASE_CAPABILITY` to `0`
 * New `clixon-config@2022-03-21.yang` revision
   * Added option:
+    * `CLICON_RESTCONF_API_ROOT`
     * `CLICON_NETCONF_BASE_CAPABILITY`
     * `CLICON_HTTP_DATA_PATH`
     * `CLICON_HTTP_DATA_ROOT`
@@ -106,6 +108,7 @@ Users may have to change how they access the system
 
 ### Corrected Bugs
 
+* Fixed: HTTP/1 parse error for '/' path
 * Fixed: YANG if-feature in config file of disables feature did not work, was always on
   * This does not apply to the datastore, only the config file itself.
 * Fixed: YANG key list check bad performance

apps/restconf/clixon_http1_parse.y

@@ -41,6 +41,7 @@
 %union {
     char *string;
     int   intval;
+    void *stack;
 }
 
 %token SP
@@ -62,8 +63,8 @@
 %token <intval> DIGIT
 
 %type <string> body
-%type <string> absolute_paths
+%type <stack>  absolute_paths
-%type <string> absolute_paths1
+%type <stack>  absolute_paths1
 %type <string> absolute_path
 %type <string> field_vchars
 %type <string> field_values
@@ -259,16 +260,16 @@ method        : TOKEN
  */
 request_target : absolute_paths1
                  {
-		      if (restconf_param_set(_HY->hy_h, "REQUEST_URI", $1) < 0)
+		     if (restconf_param_set(_HY->hy_h, "REQUEST_URI", cbuf_get($1)) < 0)
 			  YYABORT;
-		      free($1);
+		      cbuf_free($1);
 		     _PARSE_DEBUG("request-target -> absolute-paths1");
 		 }
 	        | absolute_paths1 QMARK QUERY
 		  {
-		      if (restconf_param_set(_HY->hy_h, "REQUEST_URI", $1) < 0)
+		      if (restconf_param_set(_HY->hy_h, "REQUEST_URI", cbuf_get($1)) < 0)
 			  YYABORT;
-		      free($1);
+		      cbuf_free($1);
 		      if (http1_parse_query(_HY, $3) < 0)
 			  YYABORT;
 		      free($3);
@@ -285,21 +286,25 @@ absolute_paths1 : absolute_paths
 		      { $$ = $1;_PARSE_DEBUG("absolute-paths1 -> absolute-paths / "); }
 ;
 
-/* absolute-path = 1*( "/" segment ) */
+/* absolute-path = 1*( "/" segment ) 
+*/
 absolute_paths : absolute_paths absolute_path
                  {
-		     if (($$ = clixon_string_del_join($1, "/", $2)) == NULL) { free($2); YYABORT;}
+		     $$ = $1;
-		     free($2);
+		     cprintf($$, "/");
+		     if ($2)
+			 cprintf($$, "%s", $2);
 		     _PARSE_DEBUG("absolute-paths -> absolute-paths absolute-path");
 		  }
                | absolute_path
 	         {
-		     if (($$ = clixon_string_del_join(NULL, "/", $1)) == NULL) { free($1); YYABORT;}
+		     if (($$ = cbuf_new()) == NULL){ YYABORT;}
-		     free($1);
+		     cprintf($$, "/");
+		     if ($1)
+			 cprintf($$, "%s", $1);
 		     _PARSE_DEBUG("absolute-paths -> absolute-path");
 	         }
 ;
-
 /* segment = <segment, see [RFC3986], Section 3.3> 
  * segment = *pchar
  * pchar   = unreserved / pct-encoded / sub-delims / ":" / "@"
@@ -310,8 +315,13 @@ absolute_paths : absolute_paths absolute_path
  */
 absolute_path   : SLASH PCHARS
                    {
-		       if (($$=strdup($2)) == NULL) YYABORT;
+		       $$ = $2;
-		       _PARSE_DEBUG("absolute-path -> PCHARS");
+		       _PARSE_DEBUG("absolute-path -> / PCHARS");
+		   }
+                   | SLASH
+                   {
+		       $$ = NULL;
+		       _PARSE_DEBUG("absolute-path -> /");
 		   }
 ;
 

apps/restconf/clixon_http_data.c

@@ -160,69 +160,105 @@ api_http_data_err(clicon_handle  h,
 
 /*! Check validity of path, may only be regular dir or file
  * No .., soft link, ~, etc
+ * @param[in]      h       Clicon handle
+ * @param[in]      req     Generic Www handle (can be part of clixon handle)
  * @param[in]      prefix  Prefix of path0, where to start file check
- * @param[in]  path0  Filepath
+ * @param[in,out]  cbpath  Filepath as cbuf, internal redirection may change it
- * @param[out] code   Error code, if retval = 0
+ * @param[out]     fp      Open file, if retval = 1
+ * @param[out]     fsz     Size of file, if retval = 1
  * @retval        -1       Error
- * @retval     0      Invalid, code set
+ * @retval         0       Invalid
- * @retval     1      OK
+ * @retval         1       OK, fp,fsz set
  */
 static int
-check_file_path(char   *prefix,
+http_data_check_file_path(clicon_handle h,
-		char   *path0,
+			  void         *req,
-		int    *code)
+			  char         *prefix,
+			  cbuf         *cbpath,
+			  FILE        **fp,
+			  off_t        *fsz)
 {
     int         retval = -1;
-    char *path = NULL;
-    int   i;
     struct stat fstat;
+    char       *p;
+    int         i;
+    int         code = 0;
+    FILE       *f;
 
-    if (prefix == NULL || path0 == NULL || code == NULL){
+    if (prefix == NULL || cbpath == NULL || fp == NULL){
-	clicon_err(OE_UNIX, EINVAL, "prefix, path0 or code is NULL");
+	clicon_err(OE_UNIX, EINVAL, "prefix, cbpath0 or fp is NULL");
 	goto done;
     }
-    if ((path = strdup(path0)) == NULL){
+    p = cbuf_get(cbpath);
-	clicon_err(OE_UNIX, errno, "strdup");
+    clicon_debug(1, "%s %s", __FUNCTION__, p);
+    if (strncmp(prefix, p, strlen(prefix)) != 0){
+	clicon_err(OE_UNIX, EINVAL, "prefix is not prefix of cbpath");
 	goto done;
     }
-    for (i=strlen(prefix); i<strlen(path0); i++){
+    for (i=strlen(prefix); i<strlen(p); i++){
-	if (path[i] == '/'){ /* Check valid dir */
+	if (p[i] == '/'){ /* Check valid dir */
-	    path[i] = '\0';
+	    p[i] = '\0';
 	    /* Ensure not soft link */
-	    if (lstat(path, &fstat) < 0){
+	    if (lstat(p, &fstat) < 0){
-		*code = 404;
+		clicon_debug(1, "%s Error lstat(%s):%s", __FUNCTION__, p, strerror(errno));
+		code = 404;
 		goto invalid;
 	    }
 	    if (!S_ISDIR(fstat.st_mode)){
-		*code = 403;
+		clicon_debug(1, "%s Error lstat(%s): Not dir", __FUNCTION__, p);
+		code = 403;
 		goto invalid;
 	    }
-	    path[i] = '/';
+	    p[i] = '/';
 	}
-	else if (path[i] == '~'){
+	else if (p[i] == '~'){
-	    *code = 403;
+	    clicon_debug(1, "%s Error lstat(%s): ~ not allowed in file path", __FUNCTION__, p);
+	    code = 403;
 	    goto invalid;
 	}
-	else if (path[i] == '.' && i>strlen(prefix) && path[i-1] == '.'){
+	else if (p[i] == '.' && i>strlen(prefix) && p[i-1] == '.'){
-	    *code = 403;
+	    clicon_debug(1, "%s Error lstat(%s): .. not allowed in file path", __FUNCTION__, p);
+	    code = 403;
 	    goto invalid;
 	}
     }
     /* Resulting file (ensure not soft link) */
-    if (lstat(path, &fstat) < 0){
+    if (lstat(p, &fstat) < 0){
-	*code = 404;
+	clicon_debug(1, "%s Error lstat(%s):%s", __FUNCTION__, p, strerror(errno));
+	code = 404;
 	goto invalid;
     }
+#ifdef HTTP_DATA_INTERNAL_REDIRECT
+    /* If dir try redirect, not cbpath is extended */
+    if (S_ISDIR(fstat.st_mode)){
+	cprintf(cbpath, "/%s", HTTP_DATA_INTERNAL_REDIRECT);
+	p = cbuf_get(cbpath);
+	clicon_debug(1, "%s internal redirect: %s", __FUNCTION__, p);
+	if (lstat(p, &fstat) < 0){
+	    clicon_debug(1, "%s Error lstat(%s):%s", __FUNCTION__, p, strerror(errno));
+	    code = 404;
+	    goto invalid;
+	}	
+    }
+#endif
     if (!S_ISREG(fstat.st_mode)){
-	*code = 403;
+	clicon_debug(1, "%s Error lstat(%s): Not regular file", __FUNCTION__, p);
+	code = 403;
 	goto invalid;
     }
+    *fsz = fstat.st_size;
+    if ((f = fopen(p, "rb")) == NULL){
+	clicon_debug(1, "%s Error fopen(%s) %s", __FUNCTION__, p, strerror(errno));
+	code = 403;
+	goto invalid;
+    }
+    *fp = f;
     retval = 1; /* OK */
  done:
-    if (path)
-	free(path);
     return retval;
  invalid:
+    if (api_http_data_err(h, req, code) < 0) 
+	goto done;
     retval = 0;
     goto done;
 }
@@ -231,10 +267,9 @@ check_file_path(char   *prefix,
  * @param[in]  h         Clicon handle
  * @param[in]  req       Generic Www handle (can be part of clixon handle)
  * @param[in]  pathname  With stripped prefix (eg /data), ultimately a filename
+ * @param[in]  head      HEAD not GET
  * @note: primitive file handling, just check if file exists and read it all
  * XXX 1: Buffer copying once too many, see #if 0 below
- * XXX 2: Generic file system below CLICON_HTTP_DATA_ROOT, no checks for links or ..
- *           Need pathname santitization: no .. or ~, just a directory structure.
  */
 static int
 api_http_data_file(clicon_handle h,
@@ -247,15 +282,16 @@ api_http_data_file(clicon_handle h,
     char       *filename;
     cbuf       *cbdata = NULL;
     FILE       *f = NULL;
+    off_t       fsz = 0;
     long        fsize;
     char       *www_data_root = NULL;
     char       *suffix;
     char       *media;
     int         ret;
-    int         code = 0;
     char       *str = NULL;
     size_t      sz;
 
+    clicon_debug(1, "%s", __FUNCTION__);    
     if ((cbfile = cbuf_new()) == NULL){
 	clicon_err(OE_UNIX, errno, "cbuf_new");
 	goto done;
@@ -265,7 +301,24 @@ api_http_data_file(clicon_handle h,
 	goto done;
     }
 
-    if ((suffix = rindex(pathname, '.')) == NULL){
+    cprintf(cbfile, "%s", www_data_root);
+    if (pathname){
+	if (strlen(pathname) && pathname[0] != '/'){
+	    clicon_debug(1, "%s Error fopen(%s) pathname not prefixed with /",
+			 __FUNCTION__, pathname);
+	    if (api_http_data_err(h, req, 404) < 0) 
+		goto done;
+	    goto ok;
+	}
+	cprintf(cbfile, "%s", pathname); /* Assume pathname starts with '/' */
+    }
+    if ((ret = http_data_check_file_path(h, req, www_data_root, cbfile, &f, &fsz)) < 0)
+	goto done;
+    if (ret == 0) /* Invalid, return code set */
+	goto ok;
+    filename = cbuf_get(cbfile);
+    /* Find media from file suffix, note there may have been internal indirection */
+    if ((suffix = rindex(filename, '.')) == NULL){
 	media = "application/octet-stream";
     }
     else {
@@ -273,29 +326,19 @@ api_http_data_file(clicon_handle h,
 	if ((media = clicon_str2str(mime_map, suffix)) == NULL)
 	    media = "application/octet-stream";
     }
-    cprintf(cbfile, "%s", www_data_root);
-    if (pathname)
-	cprintf(cbfile, "/%s", pathname);
-    filename = cbuf_get(cbfile);
-    clicon_debug(1, "%s %s", __FUNCTION__, filename);
-    if ((ret = check_file_path(www_data_root, filename, &code)) < 0)
-	goto done;
-    if (ret == 0){
-	clicon_debug(1, "%s code:%d", __FUNCTION__, code);
-	if (api_http_data_err(h, req, code) < 0) 
-	    goto done;
-	goto ok;
-    }
-    if ((f = fopen(filename, "rb")) == NULL){
-	if (api_http_data_err(h, req, 403) < 0) /* Forbidden or 500? */
-	    goto done;
-	goto ok;
-    }
     /* Size could have been taken from stat() but this reduces the race condition interval 
      * There is still one without flock
      */
     fseek(f, 0, SEEK_END);
     fsize = ftell(f);
+    /* Extra sanity check, had some problems with wrong file types */
+    if (fsz != fsize){
+	clicon_debug(1, "%s Error file %s size mismatch sz:%zu vs %zu",
+		     __FUNCTION__, filename, fsz, fsize);
+	if (api_http_data_err(h, req, 500) < 0) /* Internal error? */
+	    goto done;
+	goto ok;
+    }
     fseek(f, 0, SEEK_SET);  /* same as rewind(f); */
     if ((cbdata = cbuf_new_alloc(fsize+1)) == NULL){
 	clicon_err(OE_UNIX, errno, "cbuf_new_alloc");
@@ -313,11 +356,11 @@ api_http_data_file(clicon_handle h,
 	goto done;
     }
     if (sz != 1){
+	clicon_debug(1, "%s Error fread(%s) sz:%zu", __FUNCTION__, filename, sz);
 	if (api_http_data_err(h, req, 500) < 0) /* Internal error? */
 	    goto done;
 	goto ok;
     }
-    clicon_debug(1, "%s code:%d", __FUNCTION__, code);
     str[fsize] = 0;
     if (cbuf_append_str(cbdata, str) < 0){
 	clicon_err(OE_UNIX, errno, "cbuf_append_str");
@@ -329,6 +372,7 @@ api_http_data_file(clicon_handle h,
 	goto done;
     cbdata = NULL; /* consumed by reply-send */
  ok:
+    clicon_debug(1, "%s Read %s OK", __FUNCTION__, filename);
     retval = 0;
  done:
     if (str)

apps/restconf/restconf_http1.c

@@ -438,8 +438,8 @@ restconf_http1_path_root(clicon_handle  h,
 	if (api_http_data(h, sd, sd->sd_qvec) < 0)
 	    goto done;
     }
-    else if (api_root_restconf(h, sd, sd->sd_qvec) < 0) /* error handling */
+    else
-	goto done;	    
+	sd->sd_code = 404; /* catch all without body/media */
  fail:
    if (restconf_param_del_all(h) < 0)
 	goto done;

apps/restconf/restconf_nghttp2.c

@@ -473,8 +473,8 @@ http2_exec(restconf_conn        *rc,
     if ((sd->sd_path = restconf_uripath(rc->rc_h)) == NULL)
 	goto done;
     sd->sd_proto = HTTP_2; /* XXX is this necessary? */
-    if (strncmp(sd->sd_path, "/" RESTCONF_API, strlen("/" RESTCONF_API)) == 0 
+	if (strcmp(sd->sd_path, RESTCONF_WELL_KNOWN) == 0
-	|| strcmp(sd->sd_path, RESTCONF_WELL_KNOWN) == 0
+	    || api_path_is_restconf(rc->rc_h)
 	    || api_path_is_data(rc->rc_h)){
 	if (restconf_nghttp2_path(sd) < 0)
 	    goto done;

apps/restconf/restconf_root.c

@@ -80,15 +80,15 @@ api_path_is_restconf(clicon_handle h)
 {
     int    retval = 0;
     char  *path = NULL;
-    char  *restconf_path = RESTCONF_API;
+    char  *restconf_api_path;
 
    if ((path = restconf_uripath(h)) == NULL)
        goto done;
-   if (strlen(path) < 1 + strlen(restconf_path)) /* "/" + restconf */
+    if ((restconf_api_path = clicon_option_str(h, "CLICON_RESTCONF_API_ROOT")) == NULL)
 	goto done;
-   if (path[0] != '/')
+   if (strlen(path) < strlen(restconf_api_path)) /* "/" + restconf */
        goto done;
-   if (strncmp(path+1, restconf_path, strlen(restconf_path)) != 0)
+   if (strncmp(path, restconf_api_path, strlen(restconf_api_path)) != 0)
        goto done;
     retval = 1;
  done:
@@ -510,14 +510,7 @@ api_root_restconf(clicon_handle        h,
 	goto ok;
     }
     if (strlen(pvec[0]) != 0){
-	if (netconf_invalid_value_xml(&xerr, "protocol", "Invalid path, /restconf/ expected") < 0)
+	if (netconf_invalid_value_xml(&xerr, "protocol", "Invalid path, restconf api root expected") < 0)
-	    goto done; 
-	if (api_return_err0(h, req, xerr, pretty, media_out, 0) < 0)
-	    goto done;
-	goto ok;
-    }
-    if (strcmp(pvec[1], RESTCONF_API)){
-	if (netconf_invalid_value_xml(&xerr, "protocol", "Invalid path, /restconf/ expected") < 0)
 	    goto done; 
 	if (api_return_err0(h, req, xerr, pretty, media_out, 0) < 0)
 	    goto done;

apps/restconf/restconf_root.h

@@ -41,7 +41,6 @@
 /*
  * Constants
  */
-#define RESTCONF_API       "restconf"
 #define IETF_YANG_LIBRARY_REVISION    "2019-01-04"
 
 /* RESTCONF enables deployments to specify where the RESTCONF API is 

include/clixon_custom.h

@@ -99,6 +99,12 @@
  */
 #define RESTCONF_NETNS_DEFAULT "default"
 
+/*! If set make an internal redirect if URI path indetifies a directory
+ * For example, path is /local, and redirect is 'index.html, the request 
+ * will be redirected to /local/index.html
+ */
+#define HTTP_DATA_INTERNAL_REDIRECT "index.html"
+
 /*! Set a temporary parent for use in special case "when" xpath calls
  * Problem is when changing an existing (candidate) in-memory datastore that yang "when" conditionals
  * should be changed in clixon_datastore_write.c:text_modify().

test/test_http_data.sh

@@ -4,7 +4,7 @@
 # Get them via http and https
 # Send options and head request
 # Errors: not found, post, 
-# XXX: feature disabled
+# See RFC 7230
 
 # Magic line must be first in script (see README.md)
 s="$_" ; . ./lib.sh || if [ "$s" = $0 ]; then exit 0; else return 0; fi
@@ -125,12 +125,15 @@ function testrun()
     
     RESTCONFIG=$(restconf_config none false $proto $enable)
 
+    if true; then
+	# Proper test setup
 	datapath=/data
 	wdir=$dir/www
-# Host setup:
+    else
-#    datapath=/
+	# Experiments with local host
-#    wdir=/var/www/html
+	datapath=/
-
+	wdir=/var/www/html
+    fi
     # Clixon config
     cat <<EOF > $cfg
 <clixon-config xmlns="http://clicon.org/config">
@@ -191,9 +194,24 @@ EOF
 #	echo "curl $CURLOPTS -X GET -H 'Accept: text/html' $proto://localhost/data/index.html"
 	expectpart "$(curl $CURLOPTS -X GET -H 'Accept: text/html' $proto://localhost/data/index.html)" 0 "HTTP/$HVER 404"
     else
-	new "WWW get html"
+	new "WWW get root expect 404 without body"
+	expectpart "$(curl $CURLOPTS -X GET -H 'Accept: text/html' $proto://localhost/)" 0 "HTTP/$HVER 404" --not-- "Content-Type"
+	
+	new "WWW get index.html"
 	expectpart "$(curl $CURLOPTS -X GET -H 'Accept: text/html' $proto://localhost/data/index.html)" 0 "HTTP/$HVER 200" "Content-Type: text/html" "<title>Welcome to Clixon!</title>"
 	
+	new "WWW get dir -> expect index.html"
+	expectpart "$(curl $CURLOPTS -X GET -H 'Accept: text/html' $proto://localhost/data)" 0 "HTTP/$HVER 200" "Content-Type: text/html" "<title>Welcome to Clixon!</title>"
+
+	# remove index
+	mv $dir/www/data/index.html $dir/www/data/tmp.index.html
+
+	new "WWW get dir -> no indirection expect 404"
+	expectpart "$(curl $CURLOPTS -X GET -H 'Accept: text/html' $proto://localhost/data)" 0 "HTTP/$HVER 404" "Content-Type: text/html" "<title>404 Not Found</title>"
+
+	# move index back
+	mv $dir/www/data/tmp.index.html $dir/www/data/index.html 
+	
 	new "WWW get css"
 	expectpart "$(curl $CURLOPTS -X GET -H 'Accept: text/html' $proto://localhost/data/example.css)" 0 "HTTP/$HVER 200" "Content-Type: text/css" "display: inline;" --not-- "Content-Type: text/html"
 
@@ -210,6 +228,7 @@ EOF
 	new "WWW get http soft link"
 	expectpart "$(curl $CURLOPTS -X GET -H 'Accept: text/html' $proto://localhost/data/inside.html)" 0 "HTTP/$HVER 403" "Content-Type: text/html" "<title>403 Forbidden</title>" --not-- "<title>Dont access this</title>"
 
+	
 	if [ ! -f /.dockerenv ] ; then	# XXX Privs dont not work on docker/alpine?
 	    new "WWW get http not read access"
 	    expectpart "$(curl $CURLOPTS -X GET -H 'Accept: text/html' $proto://localhost/data/noread.html)" 0 "HTTP/$HVER 403" "Content-Type: text/html" "<title>403 Forbidden</title>"

yang/clixon/clixon-config@2022-03-21.yang

@@ -49,6 +49,7 @@ module clixon-config {
     revision 2022-03-21 {
 	description
 	    "Added option:
+                    CLICON_RESTCONF_API_ROOT
                     CLICON_NETCONF_BASE_CAPABILITY
                     CLICON_HTTP_DATA_PATH
                     CLICON_HTTP_DATA_ROOT
@@ -535,6 +536,13 @@ module clixon-config {
                  RFC6242 for example.
                  This only applies to the external NETCONF";
 	}
+	leaf CLICON_RESTCONF_API_ROOT {
+	    type string;
+	    default "/restconf";
+	    description
+		"The RESTCONF API root path
+                 See RFC 8040 Sec 1.16 and 3.1";
+	}
 	leaf CLICON_RESTCONF_DIR {
 	    type string;
 	    description
@@ -617,7 +625,7 @@ module clixon-config {
                  Both feature clixon-restconf:http-data and restconf/enable-http-data 
                  must be enabled for this match to occur.";
 	}
-	leaf CLICON_HTTP_DATA_ROOT {
+	leaf CLICON_HTTP_DATA_ROOT{ 
 	    if-feature "clrc:http-data";
 	    type string;
 	    default "/var/www";
@@ -1065,7 +1073,9 @@ module clixon-config {
     	    default "streams";
     	    description
 		"Stream path appended to CLICON_STREAM_URL to form
-                 stream subscription URL.";
+                 stream subscription URL.
+                 See CLICON_RESTCONF_API_ROOT and CLICON_HTTP_DATA_ROOT
+                 Should be changed to include '/' ";
 	}
 	leaf CLICON_STREAM_URL {
 	    type string;