如果是自己用c++写的server，这个错误信息一般表示客户端主动断开了连接
nginx中也有类似的错误信息，具体如下
原文：http://blog.csdn.net/kevin6216/article/details/8669293
Nginx + uWSGI，get请求头过大，报502 Bad Gateway
如下，较大的get请求：
http://192.168.1.200:10000/planner/query?getdata=1&query=%7B%22activeDayspan%22%3A%227%22%2C%22condition%22%3A%22%22%2C%22hitLimits%22%3A%22%22%2C%22groupby%22%3A%5B%5B%22wrappedInterests%22%2C400%2C%5B%5D%5D%2C%5B%22demographicGender%22%2C20%2C%5B%5D%5D%2C%5B%22demographicIncome%22%2C20%2C%5B%5D%5D%2C%5B%22demographicEducation%22%2C20%2C%5B%5D%5D%2C%5B%22umaAdsImpression%22%2C20%2C%5B%5D%5D%2C%5B%22umaCreativeImpression%22%2C20%2C%5B%5D%5D%2C%5B%22umaAdsClick%22%2C20%2C%5B%5D%5D%2C%5B%22umaCreativeClick%22%2C20%2C%5B%5D%5D%2C%5B%22dspCreativeImpression%22%2C20%2C%5B%5D%5D%2C%5B%22dspCreativeClick%22%2C20%2C%5B%5D%5D%2C%5B%22dspAdsImpression%22%2C10%2C%5B%5D%5D%2C%5B%22dspAdsClick%22%2C10%2C%5B%5D%5D%2C%5B%22viewthrough%22%2C20%2C%5B%5D%5D%2C%5B%22interests%22%2C10%2C%5B%5D%5D%2C%5B%22pid%22%2C20%2C%5B%5D%5D%2C%5B%22keyword%22%2C20%2C%5B%5D%5D%2C%5B%22companyVisited%22%2C10%2C%5B%5D%5D%2C%5B%22companyADViewed%22%2C20%2C%5B%5D%5D%2C%5B%22remarketing%22%2C20%2C%5B%5D%5D%2C%5B%22country%22%2C20%2C%5B%5D%5D%2C%5B%22province%22%2C50%2C%5B%5D%5D%2C%5B%22city%22%2C20%2C%5B%5D%5D%5D%7D&_=0.2326625478453934
NGINX中的error.log日志记录，表现为，类似：
recv() failed (104: Connection reset by peer) while reading response header from upstream
解决办法，在uwsgi中添加参数：
/usr/local/sbin/uwsgi -s 127.0.0.1:1182 -M -R 200 -p 4 --virtualenv="/usr/local/python-env/test-env" --env "DJANGO_SETTINGS_MODULE=settings" -w "django.core.handlers.wsgi:WSGIHandler()" --post-buffering32768
--buffer-size 32768