nginx使用的是1.4.5，发现产生了大量wait timeout，网上搜索得知需要指定为http 1.1及keepalive可大量减少wait-timeout连接。
修改配置添加keepalive字段到upstream。
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<code class=""><span class="line">upstream backend_abc {
</span><span class="line"> server 192.168.1.34:8086 weight=1 max_fails=2 fail_timeout=10s;
</span><span class="line"> server 192.168.1.77:8086 weight=1 max_fails=2 fail_timeout=10s;
</span><span class="line"> keepalive 16;
</span><span class="line">}</span></code>
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同时修改配置添加http1.1声明和header中connection重写。
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<code class=""><span class="line">server {
</span><span class="line"> listen 80;
</span><span class="line"> ....
</span><span class="line"> location / {
</span><span class="line"> proxy_pass http://backend_abc;
</span><span class="line"> proxy_http_version 1.1;
</span><span class="line"> proxy_redirect off;
</span><span class="line"> proxy_set_header Connection "";
</span><span class="line"> ....
</span><span class="line"> }
</span>
<span class="line"> }</span></code>
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