我使用的服务是：通用文字识别

调用的接口是：基于C++HTTP 的API

参数设置情况：none

开发平台和机型：LINUX ubuntu14.04

SDK版本号：none

代码或日志截图（上传截图能帮助您更快解决问题）：

复现步骤、现象及其他描述：

按照官方的参考选择了curl用做HTTPS的请求，代码完全参考了官方提供的例程在图片base64编码内容长度小于1024（猜测），返回结果正常。

如图：

{"log_id": 3540079175, "words_result_num": 1, "words_result": [{"location": {"width": 12, "top": 9, "height": 15, "left": 7}, "words": "8"}]}

但是图片稍微大点（1280*720）就不行了，一直认为图片格式错误：

{"log_id": 192482879, "error_code": 216201, "error_msg": "image format error"}

请问服务器是否对post的请求长度的限制实际上未达到接口文档写了4M

curl开启日志后如图：

（正常）

* Hostname was NOT found in DNS cache

*   Trying 180.97.33.131...

* Connected to aip.baidubce.com (180.97.33.131) port 443 (#1)

* successfully set certificate verify locations:

*   CAfile: none

  CApath: /etc/ssl/certs

* SSL connection using ECDHE-RSA-AES128-GCM-SHA256

* Server certificate:

* subject: CN=aip.baidubce.com

* start date: 2017-01-03 00:00:00 GMT

* expire date: 2018-01-03 23:59:59 GMT

* subjectAltName: aip.baidubce.com matched

* issuer: C=CN; O=TrustAsia Technologies, Inc.; OU=Symantec Trust Network; OU=Domain Validated SSL; CN=TrustAsia DV SSL CA - G5

* SSL certificate verify ok.

> POST /rest/2.0/ocr/v1/general?access_token=（人为删除） HTTP/1.1

Host: aip.baidubce.com

Accept: */*

Content-Length: 696（BASE64编码的内容长度）

Content-Type: multipart/form-data; boundary=------------------------afb3de091f5a2e7e

< HTTP/1.1 200 OK

< Appid: 9649372

< Connection: keep-alive

< Content-Type: application/json

< Date: Tue, 23 May 2017 03:59:00 GMT

< P3p: CP=" OTI DSP COR IVA OUR IND COM "

< P3p: CP=" OTI DSP COR IVA OUR IND COM "

* Server Apache is not blacklisted

< Server: Apache

< Set-Cookie: BAIDUID=B48DBF31C97DCCD6D8D75F0C0252AC9A:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2145916555; path=/; domain=.baidu.com; version=1

< Set-Cookie: BAIDUID=8F751CFD64738A5C90B7F6C2CFF6C877:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2145916555; path=/; domain=.baidu.com; version=1

< Vary: Accept-Encoding

< Vary: Accept-Encoding

< Content-Length: 141

< 

* Connection #1 to host aip.baidubce.com left intact

Baidu api ocr successful,json is{"log_id": 3540079175, "words_result_num": 1, "words_result": [{"location": {"width": 12, "top": 9, "height": 15, "left": 7}, "words": "8"}]}

（异常）

* Hostname was NOT found in DNS cache

*   Trying 180.97.33.131...

* Connected to aip.baidubce.com (180.97.33.131) port 443 (#1)

* successfully set certificate verify locations:

*   CAfile: none

  CApath: /etc/ssl/certs

* SSL connection using ECDHE-RSA-AES128-GCM-SHA256

* Server certificate:

* subject: CN=aip.baidubce.com

* start date: 2017-01-03 00:00:00 GMT

* expire date: 2018-01-03 23:59:59 GMT

* subjectAltName: aip.baidubce.com matched

* issuer: C=CN; O=TrustAsia Technologies, Inc.; OU=Symantec Trust Network; OU=Domain Validated SSL; CN=TrustAsia DV SSL CA - G5

* SSL certificate verify ok.

> POST /rest/2.0/ocr/v1/general?access_token=（人为删除） HTTP/1.1

Host: aip.baidubce.com

Accept: */*

Content-Length: 81276（BASE64编码后的内容长度）

Content-Type: multipart/form-data; boundary=------------------------90c54ef30b4366a1

< HTTP/1.1 200 OK

< Appid: 9649372

< Connection: keep-alive

< Content-Type: application/json

< Date: Tue, 23 May 2017 03:59:59 GMT

< P3p: CP=" OTI DSP COR IVA OUR IND COM "

< P3p: CP=" OTI DSP COR IVA OUR IND COM "

* Server Apache is not blacklisted

< Server: Apache

< Set-Cookie: BAIDUID=692C3A08312DCB3070E185997C1271A8:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2145916555; path=/; domain=.baidu.com; version=1

< Set-Cookie: BAIDUID=0155E4E87AE911E4FD5997158A620D15:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2145916555; path=/; domain=.baidu.com; version=1

< Vary: Accept-Encoding

< Vary: Accept-Encoding

< Content-Length: 78

< 

* Connection #1 to host aip.baidubce.com left intact

Baidu api ocr successful,json is{"log_id": 192482879, "error_code": 216201, "error_msg": "image format error"}