diff --git a/API.md b/API.md
index 66cc6a2..fbc1298 100644
--- a/API.md
+++ b/API.md
@@ -225,10 +225,11 @@ returns:            Dictionary of Key:Value pairs, note take care if this could
 ```
 
 ###Transports - other functions
-#####static async p_f_createReadStream(url, verbose, options)
+#####static async p_f_createReadStream(url, {wanturl, verbose})
 Provide a function of the form needed by <VIDEO> tag and renderMedia library etc
 ```
 url    Urlsof stream
+wanturl True if want the URL of the stream (for service workers)
 returns f(opts) => stream returning bytes from opts.start || start of file to opts.end-1 || end of file
 ```
 
@@ -353,7 +354,7 @@ static async p_rawlist(urls, {verbose})|[sigs]|Tries all and combines results
 static async p_rawadd(urls, sig, {verbose})||Tries on all urls, error if none succeed
 static listmonitor(urls, cb)||Tries on all urls (so note cb may be called multiple times)
 static p_newlisturls(cl, {verbose})|[urls]|Tries all and combines results
-static async p_f_createReadStream(urls, verbose, options)|f(opts)=>stream|Returns first success
+static async p_f_createReadStream(urls, options)|f(opts)=>stream|Returns first success
 static async p_get(urls, keys, {verbose})|currently returns on first success, TODO - will combine results and relay across transports
 static async p_set(urls, keyvalues, value, {verbose})|Tries all, error if none succeed
 static async p_delete(urls, keys, {verbose})|Tries all, error if none succeed
diff --git a/TransportIPFS.js b/TransportIPFS.js
index cadc5f9..031f4f1 100644
--- a/TransportIPFS.js
+++ b/TransportIPFS.js
@@ -309,7 +309,7 @@ class TransportIPFS extends Transport {
             console.log(err.message);
         }
     }
-    async p_f_createReadStream(url, verbose=false) {  // Asynchronously return a function that can be used in createReadStream  TODO-API
+    async p_f_createReadStream(url, {verbose=false}={}) {  // Asynchronously return a function that can be used in createReadStream  TODO-API
         verbose = true;
         if (verbose) console.log("p_f_createReadStream",url);
         const mh = TransportIPFS.multihashFrom(url);
diff --git a/TransportWEBTORRENT.js b/TransportWEBTORRENT.js
index a306df8..a6c9b08 100644
--- a/TransportWEBTORRENT.js
+++ b/TransportWEBTORRENT.js
@@ -96,14 +96,14 @@ class TransportWEBTORRENT extends Transport {
 
     webtorrentparseurl(url) {
         /* Parse a URL
-        url:    URL as string or already parsed into Url
+        url:    URL as string or already parsed into Url - should start magnet: or in future might support dweb:/magnet/; some other formats might be supported
         returns:    torrentid, path
          */
         if (!url) {
             throw new errors.CodingError("TransportWEBTORRENT.p_rawfetch: requires url");
         }
 
-        const urlstring = typeof url === "string" ? url : url.href
+        const urlstring = (typeof url === "string" ? url : url.href)
         const index = urlstring.indexOf('/');
 
         if (index === -1) {
@@ -159,12 +159,10 @@ class TransportWEBTORRENT extends Transport {
         const file = torrent.files.find(file => {
             return file.path === filePath;
         });
-
         if (!file) {
             //debugger;
             throw new errors.TransportError("Requested file (" + path + ") not found within torrent ");
         }
-
         return file;
     }
 
@@ -189,7 +187,7 @@ class TransportWEBTORRENT extends Transport {
             const { torrentId, path } = this.webtorrentparseurl(url);
             this.p_webtorrentadd(torrentId)
                 .then((torrent) => {
-                    torrent.deselect(0, torrent.pieces.length - 1, false); // Dont download entire torrent as will pull just the file we want
+                    torrent.deselect(0, torrent.pieces.length - 1, false); // Dont download entire torrent as will pull just the file we want (warning - may give problems if multiple reads from same webtorrent)
                     const file = this.webtorrentfindfile(torrent, path);
                     file.getBuffer((err, buffer) => {
                         if (err) {
@@ -202,16 +200,50 @@ class TransportWEBTORRENT extends Transport {
         });
     }
 
-    async p_f_createReadStream(url, verbose) {  //TODO-API
-        if (verbose) console.log("TransportWEBTORRENT p_f_createreadstream %o", url);
+    async _p_fileTorrentFromUrl(url) {
+        /*
+        Then open a webtorrent for the file specified in the path part of the url
+        url:    of form magnet:... or magnet/:...
+        return: Web Torrent file
+         */
         try {
             const {torrentId, path} = this.webtorrentparseurl(url);
             let torrent = await this.p_webtorrentadd(torrentId);
-            let filet = this.webtorrentfindfile(torrent, path);
+            torrent.deselect(0, torrent.pieces.length - 1, false); // Dont download entire torrent as will pull just the file we want (warning - may give problems if multiple reads from same webtorrent)
+            return this.webtorrentfindfile(torrent, path);
+        } catch(err) {
+            console.log(`p_fileFrom failed on ${url} ${err.message}`);
+            throw(err);
+        };
+
+    }
+    async p_f_createReadStream(url, {verbose=false, wanturl=false}={}) {  //TODO-API
+        /*
+        Fetch bytes progressively, using a node.js readable stream, based on a url of the form:
+
+
+        No assumption is made about the data in terms of size or structure.
+
+        This is the initializtion step, which returns a function suitable for <VIDEO>
+
+        Returns a new Promise that resolves to function for a node.js readable stream.
+
+        Node.js readable stream docs: https://nodejs.org/api/stream.html#stream_readable_streams
+
+        :param string url: URL of object being retrieved of form  magnet:xyzabc/path/to/file  (Where xyzabc is the typical magnet uri contents)
+        :param boolean verbose: true for debugging output
+        :resolves to: f({start, end}) => stream (The readable stream.)
+        :throws:        TransportError if url invalid - note this happens immediately, not as a catch in the promise
+         */
+        if (verbose) console.log("TransportWEBTORRENT p_f_createreadstream %o", url);
+        try {
+            let filet = this._p_fileTorrentFromUrl(url);
             let self = this;
-            return function (opts) {
-                return self.createReadStream(filet, opts, verbose);
-            };
+            if (wanturl) {
+                return url;
+            } else {
+                return function (opts) { return self.createReadStream(filet, opts, verbose); };
+            }
         } catch(err) {
             console.log(`p_f_createReadStream failed on ${url} ${err.message}`);
             throw(err);
@@ -220,35 +252,31 @@ class TransportWEBTORRENT extends Transport {
 
     createReadStream(file, opts, verbose) {
         /*
-        Fetch bytes progressively, using a node.js readable stream, based on a url of the form:
+        The function, encapsulated and inside another function by p_f_createReadStream (see docs)
 
-            magnet:xyzabc/path/to/file
-
-        (Where xyzabc is the typical magnet uri contents)
-
-        No assumption is made about the data in terms of size or structure.         Returns a new Promise that resolves to a node.js readable stream.
-
-        Node.js readable stream docs:
-        https://nodejs.org/api/stream.html#stream_readable_streams
-
-        :param string url: URL of object being retrieved
+        :param file:    Webtorrent "file" as returned by webtorrentfindfile
+        :param opts: { start: byte to start from; end: optional end byte }
         :param boolean verbose: true for debugging output
         :returns stream: The readable stream.
-        :throws:        TransportError if url invalid - note this happens immediately, not as a catch in the promise
          */
         if (verbose) console.log("TransportWEBTORRENT createreadstream %o %o", file.name, opts);
-
         try {
             const through = new stream.PassThrough();
             const fileStream = file.createReadStream(opts);
             fileStream.pipe(through);
             return through;
         } catch(err) {
+            console.log("TransportWEBTORRENT caught error", err)
             if (typeof through.destroy === 'function') through.destroy(err)
             else through.emit('error', err)
         };
     }
 
+    async p_createReadStream(url, opts, verbose) {
+        let filet = await this._p_fileTorrentFromUrl(url);
+        return this.createReadStream(filet, opts, verbose);
+    }
+
     static async p_test(opts, verbose) {
         try {
             let transport = await this.p_setup(opts, verbose); // Assumes IPFS already setup
diff --git a/Transports.js b/Transports.js
index 18ac04f..b315703 100644
--- a/Transports.js
+++ b/Transports.js
@@ -33,7 +33,10 @@ class Transports {
          */
         return this._transports.map((t) => { return {"name": t.name, "status": t.status}})
     }
-
+    static async p_urlsValidFor(urls, func, options) {
+        // Need a async version of this for serviceworker and TransportsProxy
+        return this.validFor(urls, func, options).map((ut) => ut[0]);
+    }
     static validFor(urls, func, options) {
         /*
         Finds an array or Transports that can support this URL.
@@ -65,6 +68,11 @@ class Transports {
         return Transports._connected().find((t) => t.name === "IPFS")
     }
 
+    static webtorrent(verbose) {
+        // Find an ipfs transport if it exists, so for example ServiceWorker.p_respondWebTorrent can use it.
+        return Transports._connected().find((t) => t.name === "WEBTORRENT")
+    }
+
     static async p_resolveNames(urls) {
         /* If and only if TransportNAME was loaded (it might not be as it depends on higher level classes like Domain and SmartDict)
             then resolve urls that might be names, returning a modified array.
@@ -233,12 +241,12 @@ class Transports {
 
     // Stream handling ===========================================
     
-    static async p_f_createReadStream(urls, verbose, options) { // Note options is options for selecting a stream, not the start/end in a createReadStream call
+    static async p_f_createReadStream(urls, {verbose=false, wanturl=false}={}) { // Note options is options for selecting a stream, not the start/end in a createReadStream call
         /*
         urls:   Urls of the stream
         returns:    f(opts) => stream returning bytes from opts.start || start of file to opts.end-1 || end of file
          */
-        let tt = this.validFor(urls, "createReadStream", options); //[ [Url,t],[Url,t]]  // Passing options - most callers will ignore TODO-STREAM support options in validFor
+        let tt = this.validFor(urls, "createReadStream", {}); //[ [Url,t],[Url,t]]  // Can pass options TODO-STREAM support options in validFor
         if (!tt.length) {
             throw new errors.TransportError("Transports.p_createReadStream cant find any transport for urls: " + urls);
         }
@@ -246,7 +254,7 @@ class Transports {
         let errs = [];
         for (const [url, t] of tt) {
             try {
-                return await t.p_f_createReadStream(url, verbose);
+                return await t.p_f_createReadStream(url, {verbose, wanturl} );
             } catch (err) {
                 errs.push(err);
                 console.log("Could not retrieve ", url.href, "from", t.name, err.message);
@@ -510,12 +518,10 @@ class Transports {
             if (! tabbrevs.length) { tabbrevs = ["HTTP", "YJS", "IPFS", "WEBTORRENT"]; }
             tabbrevs = tabbrevs.map(n => n.toUpperCase());
             let transports = this.setup0(tabbrevs, options, verbose);
-            //TODO-SW copy this statuselement buildout somewhere for proxy too
             if (options.statuscb) {
                 this.statuscb = options.statuscb;
             }
             if (!!options.statuselement) {
-                //TODO-SW need to return status through messages
                 while (statuselement.lastChild) {statuselement.removeChild(statuselement.lastChild); }   // Remove any exist status
                 statuselement.appendChild(
                     utils.createElement("UL", {}, transports.map(t => {