修改NGINX 0.6.x源代码，实现具有健康检查的URL HASH功能

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<
---
> ngx_str_t s;
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<     ngx_str_t val;
<
<     if (ngx_http_script_run(r, &val, us->lengths, 0, us->values) == NULL) {
<         return NGX_ERROR;
<     }
---
>           ngx_str_t val;
>       val.data = r->uri.data;
>  if (r->args.data) val.len = r->uri.len+1+r->args.len;
> else val.len = r->uri.len;
> ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,                           "myuri: "%V"", &val);
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<     /* iphp->hash = 89; */
---
>      //iphp->hash = 89;
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<
---
>     iphp->s = val;
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>    u_char mybuff[1024*100];
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<
---
>       u_char bFirst = 1;
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>
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>                   ngx_log_error(NGX_LOG_ERR, pc->log, 0, "hash to peer:%s",inet_ntoa(((struct sockaddr_in*)peer->sockaddr)->sin_addr));
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>                   ngx_log_error(NGX_LOG_ERR, pc->log, 0,"fail! hash to peer:%s",inet_ntoa(((struct sockaddr_in*)peer->sockaddr)->sin_addr));
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<
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>       if ( iphp->s.len >= sizeof(mybuff) )
>       {ngx_log_error(NGX_LOG_ERR, pc->log, 0, "too long uri, size of mybuff is %d", sizeof(mybuff));
>               hash ++;continue;
>       }
>       else
>       {
>               if ( bFirst )
>               {
>                       bFirst = 0;
>                       ngx_memset(mybuff,'a', sizeof(mybuff));
>                       ngx_memcpy(mybuff,iphp->s.data, iphp->s.len);
>                       iphp->s.data = mybuff;
>               }
>       }
>       iphp->s.len++;
>
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<         hash+=(ngx_uint_t) now;
<
---
>         hash = ngx_http_upstream_hash_crc32(iphp->s.data, iphp->s.len);
>       ngx_log_error(NGX_LOG_ERR, pc->log, 0, "rehash ");