Unable to download text file through Chunked transfer encoding

#### Issue

**1. What problem do you get?**
I'm not able to download one text file (VTT file). Presumably, it's because the server is using Chunked transfer encoding.

**2. Which version of FileDownloader are you using when you produce such problem?**
Version 1.7.4

**3. How to reproduce such problem?**
Just try downloading the following VTT file. Please note that I added the VTT url to Bitly, because the url expires and I can keep updating it for testing purposes: http://bit.ly/2HtV0gP
You might need to get the redirect url first. Please let me know if the url expires.

**4. Do you set `FileDownloadLog.NEED_LOG=true`?**
Yes

**5. Could you please reproduce this problem and provide all main process and `:filedownloader` process logcat**
See the logcat below.

**6. Can you fix it by yourself and request PR, if not, what's problem do you get when you try to fix it**
Not at this moment

/////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////MAIN PROCESS LOG////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////
06-07 17:10:45.678 15132-15132/com.example.bugapp I/zygote64: Late-enabling -Xcheck:jni
06-07 17:10:45.786 15132-15150/com.example.bugapp D/libEGL: loaded /vendor/lib64/egl/libEGL_adreno.so
06-07 17:10:45.792 15132-15150/com.example.bugapp D/libEGL: loaded /vendor/lib64/egl/libGLESv1_CM_adreno.so
06-07 17:10:45.805 15132-15150/com.example.bugapp D/libEGL: loaded /vendor/lib64/egl/libGLESv2_adreno.so
06-07 17:10:45.864 15132-15171/com.example.bugapp D/OpenGLRenderer: HWUI GL Pipeline
06-07 17:10:45.900 15132-15171/com.example.bugapp I/Adreno: QUALCOMM build : 594927b, I916dfac403
Build Date : 10/11/17
OpenGL ES Shader Compiler Version: EV031.21.02.00
Local Branch : mybranch28618966
Remote Branch : quic/gfx-adreno.lnx.6.4.9-rel
Remote Branch : NONE
Reconstruct Branch : NOTHING
06-07 17:10:45.905 15132-15171/com.example.bugapp I/Adreno: PFP: 0x005ff087, ME: 0x005ff063
06-07 17:10:45.910 15132-15171/com.example.bugapp I/zygote64: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasWideColorDisplay retrieved: 1
06-07 17:10:45.910 15132-15171/com.example.bugapp I/OpenGLRenderer: Initialized EGL, version 1.4
06-07 17:10:45.910 15132-15171/com.example.bugapp D/OpenGLRenderer: Swap behavior 2
06-07 17:10:55.359 15132-15301/com.example.bugapp I/ODRM: Starting downloadOneByOne
06-07 17:10:55.373 15132-15301/com.example.bugapp D/FileDownloader.DownloadTask: setPath /storage/emulated/0/Android/data/com.example.bugapp/files/Download
06-07 17:10:55.374 15132-15301/com.example.bugapp D/FileDownloader.DownloadTask: setListener com.example.bugapp.util.DownloadIntentService$MyFileDownloadListener@f4140ac
06-07 17:10:55.374 15132-15301/com.example.bugapp V/FileDownloader.DownloadTaskHunter: call start Url[http://bcboltproduse1-a.akamaihd.net/media/v1/text/vtt/clear/5783296997001/9f8be68c-fd34-4b94-922e-ce97768dd48d/8d06ebef-49db-43fe-921a-c6a38b777a91/text.vtt?akamai_token=exp=1528428442~acl=/media/v1/text/vtt/clear/5783296997001/9f8be68c-fd34-4b94-922e-ce97768dd48d/8d06ebef-49db-43fe-921a-c6a38b777a91/text.vtt*~hmac=77a5a4c6cb010b8594b9e55a7f35f3a6e0fda9f7713b752dd81815860882b896], Path[/storage/emulated/0/Android/data/com.example.bugapp/files/Download] Listener[com.example.bugapp.util.DownloadIntentService$MyFileDownloadListener@f4140ac], Tag[null]
06-07 17:10:55.377 15132-15303/com.example.bugapp V/FileDownloader.FileDownloadEventPool: setListener event.service.connect.changed
06-07 17:10:55.378 15132-15301/com.example.bugapp V/FileDownloader.DownloadTaskHunter: the task[-818857745] has been into the launch pool.
06-07 17:10:55.378 15132-15301/com.example.bugapp I/ODRM: Checking that atomic integer is ZERO
06-07 17:10:55.380 15132-15303/com.example.bugapp I/FileDownloader.FileDownloadProperties: init properties 0
load properties: http.lenient=FALSE; process.non-separate=FALSE; download.min-progress-step=65536; download.min-progress-time=2000; download.max-network-thread-count=3; file.non-pre-allocation=FALSE; broadcast.completed=FALSE; download.trial-connection-head-method=FALSE
06-07 17:10:55.381 15132-15303/com.example.bugapp D/FileDownloader.LostServiceConnectedHandler: Waiting for connecting with the downloader service... -818857745
06-07 17:10:55.383 15132-15303/com.example.bugapp D/FileDownloader.FileDownloadServiceUIGuard: bindStartByContext PlaybackTestApplication
06-07 17:10:55.398 15132-15303/com.example.bugapp D/FileDownloader.DownloadTaskHunter: free the task -818857745, when the status is 10
06-07 17:10:55.493 15132-15132/com.example.bugapp D/FileDownloader.FileDownloadServiceUIGuard: onServiceConnected ComponentInfo{com.example.bugapp/com.liulishuo.filedownloader.services.FileDownloadService$SeparateProcessService} com.liulishuo.filedownloader.i.IFileDownloadIPCService$Stub$Proxy@a935ff1
06-07 17:10:55.494 15132-15132/com.example.bugapp V/FileDownloader.FileDownloadEventPool: asyncPublishInNewThread event.service.connect.changed
06-07 17:10:55.495 15132-15321/com.example.bugapp V/FileDownloader.FileDownloadEventPool: publish event.service.connect.changed
06-07 17:10:55.496 15132-15321/com.example.bugapp D/FileDownloader.LostServiceConnectedHandler: The downloader service is connected.
06-07 17:10:55.496 15132-15321/com.example.bugapp V/FileDownloader.DownloadTaskHunter: call start Url[http://bcboltproduse1-a.akamaihd.net/media/v1/text/vtt/clear/5783296997001/9f8be68c-fd34-4b94-922e-ce97768dd48d/8d06ebef-49db-43fe-921a-c6a38b777a91/text.vtt?akamai_token=exp=1528428442~acl=/media/v1/text/vtt/clear/5783296997001/9f8be68c-fd34-4b94-922e-ce97768dd48d/8d06ebef-49db-43fe-921a-c6a38b777a91/text.vtt*~hmac=77a5a4c6cb010b8594b9e55a7f35f3a6e0fda9f7713b752dd81815860882b896], Path[/storage/emulated/0/Android/data/com.example.bugapp/files/Download] Listener[com.example.bugapp.util.DownloadIntentService$MyFileDownloadListener@f4140ac], Tag[null]
06-07 17:10:55.497 15132-15321/com.example.bugapp V/FileDownloader.DownloadTaskHunter: the task[-818857745] has been into the launch pool.
06-07 17:10:55.498 15132-15322/com.example.bugapp D/FileDownloader.FileDownloadMessenger: notify begin -818857745@com.liulishuo.filedownloader.DownloadTask@458f944
06-07 17:10:55.498 15132-15322/com.example.bugapp V/FileDownloader.DownloadTaskHunter: filedownloader:lifecycle:start com.liulishuo.filedownloader.DownloadTaskHunter@46d0a2d by 11
06-07 17:10:55.499 15132-15322/com.example.bugapp V/FileDownloader.FileDownloadList: add list in all -818857745@com.liulishuo.filedownloader.DownloadTask@458f944 11 1
06-07 17:10:55.521 15132-15325/com.example.bugapp D/FileDownloader.MessageSnapshotGate: ~~~callback -818857745 old[11] new[1] 1
06-07 17:10:55.522 15132-15325/com.example.bugapp D/FileDownloader.FileDownloadMessenger: notify pending -818857745@com.liulishuo.filedownloader.DownloadTask@458f944
06-07 17:10:55.523 15132-15325/com.example.bugapp D/FileDownloader.MessageSnapshotGate: updateKeepFlow
06-07 17:10:55.524 15132-15325/com.example.bugapp D/FileDownloader.MessageSnapshotGate: ~~~callback -818857745 old[1] new[6] 1
06-07 17:10:55.524 15132-15325/com.example.bugapp D/FileDownloader.FileDownloadMessenger: notify started -818857745@com.liulishuo.filedownloader.DownloadTask@458f944
06-07 17:10:55.524 15132-15325/com.example.bugapp D/FileDownloader.MessageSnapshotGate: updateKeepFlow
06-07 17:10:55.729 15132-15325/com.example.bugapp D/FileDownloader.MessageSnapshotGate: ~~~callback -818857745 old[6] new[2] 1
06-07 17:10:55.730 15132-15325/com.example.bugapp D/FileDownloader.FileDownloadMessenger: notify connected -818857745@com.liulishuo.filedownloader.DownloadTask@458f944
06-07 17:10:55.731 15132-15325/com.example.bugapp D/FileDownloader.MessageSnapshotGate: updateKeepFlow
06-07 17:10:55.831 15132-15325/com.example.bugapp D/FileDownloader.MessageSnapshotGate: ~~~callback -818857745 old[2] new[-1] 1
06-07 17:10:55.832 15132-15325/com.example.bugapp V/FileDownloader.FileDownloadList: remove -818857745@com.liulishuo.filedownloader.DownloadTask@458f944 left -1 0
06-07 17:10:55.833 15132-15325/com.example.bugapp D/FileDownloader.FileDownloadMessenger: notify error -818857745@com.liulishuo.filedownloader.DownloadTask@458f944 com.liulishuo.filedownloader.exception.FileDownloadGiveUpRetryException: can't know the size of the download file, and its Transfer-Encoding is not Chunked either.
you can ignore such exception by add http.lenient=true to the filedownloader.properties
06-07 17:10:55.833 15132-15325/com.example.bugapp V/FileDownloader.DownloadTaskHunter: filedownloader:lifecycle:over com.liulishuo.filedownloader.DownloadTaskHunter@46d0a2d by -1
06-07 17:10:55.834 15132-15325/com.example.bugapp D/FileDownloader.MessageSnapshotGate: updateKeepFlow

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////FILEDOWNLOADER service LOG//////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
06-07 17:10:55.401 15304-15304/? I/zygote64: Late-enabling -Xcheck:jni
06-07 17:10:55.523 15304-15324/com.example.bugapp:filedownloader D/NetworkSecurityConfig: No Network Security Config specified, using platform default