OTA升级提示fail to download，如何解决

[xwdreamer]

在控制台操作升级固件，在设备端提示如下日志： —————————————————————————— [dbg] httpclient_common(785): host: 'iotx-ota.oss-cn-shanghai.aliyuncs.com', port: 443 LINUXSOCK 77 HAL_TCP_Establish() | establish tcp connection with server(host=iotx-ota.oss-cn-shanghai.aliyuncs.com port=443) LINUXSOCK 116 HAL_TCP_Establish() | success to establish tcp, fd=5 [dbg] httpclient_send_header(317): REQUEST (Length: 328 Bytes)

GET /ota/4ab1305d8620198918b921eb5b330bdb/cjnng5uee0001396wk1er8vjm.zip?Expires=1540440613&OSSAccessKeyId=cS8uRRy54RszYWna&Signature=0OE%2B2JqLwBdzyWn6dNVBoLbjkA0%3D HTTP/1.1 Host: iotx-ota.oss-cn-shanghai.aliyuncs.com Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8 Accept-Encoding: gzip, deflate

[dbg] httpclient_send_header(322): Written 328 bytes [inf] httpclient_recv(384): 32 bytes has been read [dbg] httpclient_recv_response(760): RESPONSE (Length: 32 Bytes) < HTTP/1.1 400 Bad Request < Server [wrn] httpclient_response_parse(643): Response code 400 [dbg] httpclient_response_parse(646): Reading headers: HTTP/1.1 400 Bad Request [inf] httpclient_recv(384): 32 bytes has been read [inf] httpclient_recv(384): 32 bytes has been read [inf] httpclient_recv(384): 32 bytes has been read [inf] httpclient_recv(384): 32 bytes has been read [dbg] httpclient_retrieve_content(428): Current data: <!DOCTYPE H [dbg] httpclient_retrieve_content(534): Total-Payload: 281 Bytes; Read: 11 Bytes [inf] httpclient_recv(384): 270 bytes has been read [dbg] httpclient_retrieve_content(589): no more (content-length) [inf] httpclient_common(828): close http channel [dbg] httpclient_close(774): client disconnected mqtt_client|247 :: ota fetch fail —————————————————————————— 我自己拼装上面的url，又是可以下载到固件的 https://iotx-ota.oss-cn-shanghai.aliyuncs.com/ota/4ab1305d8620198918b921eb5b330bdb/cjnng5uee0001396wk1er8vjm.zip?Expires=1540440613&OSSAccessKeyId=cS8uRRy54RszYWna&Signature=0OE%2B2JqLwBdzyWn6dNVBoLbjkA0%3D

问题： 为何会提示fail to down

[xwdreamer]

sdk版本：RELEASED_V2_10_20180331.zip

[xwdreamer]

通过wireshark抓包，完整的返回信息如下，在线等，请大神帮忙忙。

[LeeSSXX]

用2.3.0吧