upstream upstream1{
}
upstream upstream2{
}
upstream upstream3{
}
upstream upstream4{
}
request url is http://xxxx.com/id=xxx&key=xxx
if (id is 1~100 key=key1) send to upstream1
if (id is 1~100 key=key2) send to upstream2
if (id is 101~200 key=key1) send to upstream3
if (id is 101~200 key=key2 ) send to upstream4
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