allow for all upload protocols

seems to be working
closes #5305

docs/companion.md

@@ -643,8 +643,10 @@ fully downloaded first, then uploaded. Defaults to `true`.
 
 A boolean flag to tell Companion whether to also upload files that have an
 unknown size. Currently this is only supported for Tus uploads. Note that this
-requires an optional extension on the Tus server. Default is `false`. If set to
-`true`, `streamingUpload` has to be also set to `true`.
+requires an optional extension on the Tus server if using Tus uploads. For form
+multipart uploads it requres a server that can handle
+`transfer-encoding: chunked`. Default is `false`. If set to `true`,
+`streamingUpload` also has to be set to `true`.
 
 #### `maxFileSize` `COMPANION_MAX_FILE_SIZE`
 

packages/@uppy/companion/src/server/Uploader.js

@@ -269,14 +269,10 @@ class Uploader {
   }
 
   _canStream() {
-    const protocol = this._getUploadProtocol()
-
     return this.options.companionOptions.streamingUpload && (
       this.options.size
       // only tus uploads can be streamed without size, TODO: add also others
-      || (this.options.companionOptions.streamingUploadSizeless && (
-        protocol === PROTOCOLS.tus
-      ))
+      || this.options.companionOptions.streamingUploadSizeless
     )
   }
 
@@ -619,7 +615,7 @@ class Uploader {
 
       const response = await runRequest(url, reqOptions)
 
-      if (bytesUploaded !== this.size) {
+      if (this.size != null && bytesUploaded !== this.size) {
         const errMsg = `uploaded only ${bytesUploaded} of ${this.size} with status: ${response.statusCode}`
         logger.error(errMsg, 'upload.multipart.mismatch.error')
         throw new Error(errMsg)