try on all hosts for media

src/WAConnection/4.Events.ts

@@ -7,7 +7,6 @@ export class WAConnection extends Base {
 
     constructor () {
         super ()
-        
         // new messages
         this.registerCallback(['action', 'add:relay', 'message'], json => {
             const message = json[2][0][2] as WAMessage

src/WAConnection/6.MessagesSend.ts

@@ -109,20 +109,30 @@ export class WAConnection extends Base {
         // send a query JSON to obtain the url & auth token to upload our media
         const json = await this.refreshMediaConn ()
         const auth = json.auth // the auth token
-        const hostname = `https://${json.hosts[0].hostname}${MediaPathMap[mediaType]}/${fileEncSha256B64}?auth=${auth}&token=${fileEncSha256B64}`
-        
-        const urlFetch = await fetch(hostname, {
-            method: 'POST',
-            body: body,
-            headers: { Origin: 'https://web.whatsapp.com' },
-        })
-        const responseJSON = await urlFetch.json()
-        if (!responseJSON.url) {
-            throw new Error('Upload failed got: ' + JSON.stringify(responseJSON))
+
+        let mediaUrl: string
+        for (let host of json.hosts) {
+            const hostname = `https://${host.hostname}${MediaPathMap[mediaType]}/${fileEncSha256B64}?auth=${auth}&token=${fileEncSha256B64}`
+            try {
+                const urlFetch = await fetch(hostname, {
+                    method: 'POST',
+                    body: body,
+                    headers: { Origin: 'https://web.whatsapp.com' },
+                })
+                mediaUrl = (await urlFetch.json())?.url
+                
+                if (mediaUrl) break
+                else throw new Error (`upload failed`)
+            } catch (error) {
+                const isLast = host.hostname === json.hosts[json.hosts.length-1].hostname
+                this.log (`Error in uploading to ${host}${isLast ? '' : ', retrying...'}`, MessageLogLevel.info)
+            }
         }
+        if (!mediaUrl) throw new Error('Media upload failed on all hosts')
+
         const message = {}
         message[mediaType] = {
-            url: responseJSON.url,
+            url: mediaUrl,
             mediaKey: mediaKey.toString('base64'),
             mimetype: options.mimetype,
             fileEncSha256: fileEncSha256B64,