set content length limit if half open range request fails

content/browser/download/parallel_download_job.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/download/parallel_download_job.h"
 
 #include "base/memory/ptr_util.h"
 #include "content/browser/download/download_create_info.h"
 #include "content/browser/download/parallel_download_utils.h"
 #include "content/public/browser/browser_context.h"
@@ skipping 99 matching lines @@
     worker->Cancel();
   }
 }
 
 void ParallelDownloadJob::OnServerResponseError(
     DownloadWorker* worker,
     DownloadInterruptReason reason) {
   // TODO(xingliu): Consider to let the original request to cover the full
   // content if the sub-requests get invalid response. Consider retry on certain
   // error.
+  if (worker->length() == DownloadSaveInfo::kLengthFullContent &&
+      reason ==
+          DownloadInterruptReason::DOWNLOAD_INTERRUPT_REASON_SERVER_NO_RANGE) {
+    SetPotentialFileLength(worker->offset());
+    return;
+  }
   DownloadJob::Interrupt(reason);
 }
 
 void ParallelDownloadJob::BuildParallelRequests() {
   DCHECK(!requests_sent_);
   DCHECK(!is_paused());
   if (is_canceled_)
     return;
 
   // TODO(qinmin): The size of |slices_to_download| should be no larger than
@@ skipping 86 matching lines @@
   // download request.
   download_params->set_referrer(Referrer(download_item_->GetReferrerUrl(),
                                          blink::WebReferrerPolicyAlways));
   // Send the request.
   worker->SendRequest(std::move(download_params));
   DCHECK(workers_.find(offset) == workers_.end());
   workers_[offset] = std::move(worker);
 }
 
 }  // namespace content