diff --git a/TransportHTTP.js b/TransportHTTP.js
index d21f6b7..0694232 100644
--- a/TransportHTTP.js
+++ b/TransportHTTP.js
@@ -119,7 +119,7 @@ class TransportHTTP extends Transport {
          */
         //PY: res = self._sendGetPost(True, "rawstore", headers={"Content-Type": "application/octet-stream"}, urlargs=[], data=data)
         console.assert(data, "TransportHttp.p_rawstore: requires data");
-        const res = await httptools.p_POST(this._cmdurl(servercommands.rawstore), "application/octet-stream", data); // resolves to URL
+        const res = await httptools.p_POST(this._cmdurl(servercommands.rawstore), {data, contenttype: "application/octet-stream"}); // resolves to URL
         let parsedurl = Url.parse(res);
         let pathparts = parsedurl.pathname.split('/');
         return `contenthash:/contenthash/${pathparts.slice(-1)}`
@@ -129,8 +129,8 @@ class TransportHTTP extends Transport {
     p_rawadd(url, sig) {
         // Logged by Transports
         if (!url || !sig) throw new errors.CodingError("TransportHTTP.p_rawadd: invalid parms", url, sig);
-        let value = stringify(sig.preflight(Object.assign({},sig)))+"\n";
-        return httptools.p_POST(this._url(url, servercommands.rawadd), "application/json", value); // Returns immediately
+        const data = stringify(sig.preflight(Object.assign({},sig)))+"\n";
+        return httptools.p_POST(this._url(url, servercommands.rawadd), {data, contenttype: "application/json"}); // Returns immediately
     }
 
     p_newlisturls(cl) {
@@ -257,11 +257,11 @@ class TransportHTTP extends Transport {
         // Logged by Transports
         //debughttp("p_set %o %o %o", url, keyvalues, value);
         if (typeof keyvalues === "string") {
-            let kv = stringify([{key: keyvalues, value: value}]);
-            await httptools.p_POST(this._url(url, servercommands.set), "application/json", kv); // Returns immediately
+            let data = stringify([{key: keyvalues, value: value}]);
+            await httptools.p_POST(this._url(url, servercommands.set), {data, contenttype: "application/json"}); // Returns immediately
         } else {
-            let kv = stringify(Object.keys(keyvalues).map((k) => ({"key": k, "value": keyvalues[k]})));
-            await httptools.p_POST(this._url(url, servercommands.set), "application/json", kv); // Returns immediately
+            let data = stringify(Object.keys(keyvalues).map((k) => ({"key": k, "value": keyvalues[k]})));
+            await httptools.p_POST(this._url(url, servercommands.set), {data, contenttype: "application/json"}); // Returns immediately
         }
     }
 
diff --git a/httptools.js b/httptools.js
index 588b348..9d37332 100644
--- a/httptools.js
+++ b/httptools.js
@@ -98,16 +98,16 @@ httptools.p_httpfetch = async function(httpurl, init, {wantstream=false}={}) { /
     }
 }
 
-
-httptools.p_GET = function(httpurl, opts={}) {
+httptools.p_GET = function(httpurl, opts={}, cb) { //TODO-API rearranged and addded cb
     /*  Locate and return a block, based on its url
         Throws TransportError if fails
         opts {
             start, end,     // Range of bytes wanted - inclusive i.e. 0,1023 is 1024 bytes
             wantstream,     // Return a stream rather than data
             }
-        resolves to: URL that can be used to fetch the resource, of form contenthash:/contenthash/Q123
+        returns result via promise or cb(err, result)
     */
+    if (typeof opts  === "function") { cb = opts; opts = {}; }
     let headers = new Headers();
     if (opts.start || opts.end) headers.append("range", `bytes=${opts.start || 0}-${(opts.end<Infinity) ? opts.end : ""}`);
     let init = {    //https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch
@@ -118,13 +118,18 @@ httptools.p_GET = function(httpurl, opts={}) {
         redirect: 'follow',  // Chrome defaults to manual
         keepalive: true    // Keep alive - mostly we'll be going back to same places a lot
     };
-    return httptools.p_httpfetch(httpurl, init, {wantstream: opts.wantstream}); // This s a real http url
+    const prom = httptools.p_httpfetch(httpurl, init, {wantstream: opts.wantstream}); // This s a real http url
+    if (cb) { prom.then((res)=>cb(null,res)).catch((err) => cb(err)); } else { return prom; } // Unpromisify pattern v3
 }
-httptools.p_POST = function(httpurl, type, data) {
-    // Locate and return a block, based on its url
+httptools.p_POST = function(httpurl, opts={}, cb) { //TODO-API rearranged and addded cb
+    /* Locate and return a block, based on its url
+    opts = { data, contenttype }
+    returns result via promise or cb(err, result)
+     */
     // Throws TransportError if fails
     //let headers = new window.Headers();
     //headers.set('content-type',type); Doesn't work, it ignores it
+    if (typeof opts  === "function") { cb = opts; opts = {}; }
     let init = {
         //https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch
         //https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_header_name for headers tat cant be set
@@ -137,7 +142,10 @@ httptools.p_POST = function(httpurl, type, data) {
         redirect: 'follow',  // Chrome defaults to manual
         keepalive: true    // Keep alive - mostly we'll be going back to same places a lot
     };
-    return httptools.p_httpfetch(httpurl, init);
+    const prom = httptools.p_httpfetch(httpurl, init);
+    if (cb) { prom.then((res)=>cb(null,res)).catch((err) => cb(err)); } else { return prom; } // Unpromisify pattern v3
 }
 
+
+
 exports = module.exports = httptools;
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