如何进行编译？

到底是对所有请求生效，还是只对某个域名下的请求，亦或者是某类URL下的请求生效呢？这很难定义，也难以展示。Nginx可以检测到非法的配置，但这个配置的生效范围非常复杂，通常需要基于规则、经验判断，以及自己构造请求来验证（只需要将Content-Length头部设到10GB以上，不用真的传输这么大的文件）

第1种。参考官方文档：

“When buffering is enabled, nginx receives a response from the proxied server as soon as possible, saving it into the buffers set by the proxy_buffer_size and proxy_buffers directives. If the whole response does not fit into memory, a part of it can be saved to a temporary file on the disk. Writing to temporary files is controlled by the proxy_max_temp_file_size and proxy_temp_file_write_size directives.

When buffering is disabled, the response is passed to a client synchronously, immediately as it is received. nginx will not try to read the whole response from the proxied server. The maximum size of the data that nginx can receive from the server at a time is set by the proxy_buffer_size directive.”