Enables or disables the use of the TCP_NOPUSH socket option on FreeBSD or the TCP_CORK socket option on Linux. The options are enabled only when sendfile is used. Enabling the option allows 1、sending the response header and the beginning of a file in one packet, on Linux and FreeBSD 4.x; 2、sending a file in full packets.
The first parameter sets a timeout during which a keep-alive client connection will stay open on the server side. The zero value disables keep-alive client connections.
Defines a timeout for reading client request header. If a client does not transmit the entire header within this time, the 408 (Request Time-out) error is returned to the client.
Defines a timeout for reading client request body. The timeout is set only for a period between two successive read operations, not for the transmission of the whole request body. If a client does not transmit anything within this time, the 408 (Request Time-out) error is returned to the client.
连续两次读取body的超时时间
ngx_http_core_module
send_timeout
send_timeout 60s;
http, server, location
Sets a timeout for transmitting a response to the client. The timeout is set only between two successive write operations, not for the transmission of the whole response. If the client does not receive anything within this time, the connection is closed.
Sets buffer size for reading client request header. For most requests, a buffer of 1K bytes is enough. However, if a request includes long cookies, or comes from a WAP client, it may not fit into 1K. If a request line or a request header field does not fit into this buffer then larger buffers, configured by the large_client_header_buffers directive, are allocated.
Sets the maximum number and size of buffers used for reading large client request header. A request line cannot exceed the size of one buffer, or the 414 (Request-URI Too Large) error is returned to the client. A request header field cannot exceed the size of one buffer as well, or the 400 (Bad Request) error is returned to the client. Buffers are allocated only on demand. By default, the buffer size is equal to 8K bytes. If after the end of request processing a connection is transitioned into the keep-alive state, these buffers are released.
定义了Nginx接收一个超大HTTP头部请求的buffer个数和每个buffer的大小。如果HTTP请求行（如GET/index HTTP/1.1）的大小超过上面的单个buffer，则返回Request URI too large(414)。请求中一般会有许多header，每一个header的大小也不能超过单个buffer的大小，否则会返回Bad request(400)。当然，请求行和请求头部的总和也不可以超过buffer个数*buffer大小。
ngx_http_core_module
client_max_body_size
client_max_body_size 1m;
http, server, location
Sets the maximum allowed size of the client request body, specified in the “Content-Length” request header field. If the size in a request exceeds the configured value, the 413 (Request Entity Too Large) error is returned to the client. Please be aware that browsers cannot correctly display this error. Setting size to 0 disables checking of client request body size.
浏览器在发送含有较大HTTP包体的请求时，其头部会有一个Content-Length字段，client_max_body_size是用来限制Content-Length所示值的大小的。因此，这个限制包体的配置非常有用处，因为不用等Nginx接收完所有的HTTP包体，这有可能消耗很长时间，就可以告诉用户请求过大不被接受。例如，用户试图上传一个10GB的文件，Nginx在收完包头后，发现Content-Length超过client_max_body_size定义的值，就直接发送413(Request Entity Too Large)响应给客户端。
ngx_http_core_module
client_body_temp_path
client_body_temp_path client_body_temp;
http, server, location
Defines a directory for storing temporary files holding client request bodies. Up to three-level subdirectory hierarchy can be used under the specified directory. For example, in the following configuration
Sets buffer size for reading client request body. In case the request body is larger than the buffer, the whole body or only its part is written to a temporary file. By default, buffer size is equal to two memory pages. This is 8K on x86, other 32-bit platforms, and x86-64. It is usually 16K on other 64-bit platforms.
Enables or disables buffering of responses from the proxied server.
是否开启对后端response的缓冲
ngx_http_proxy_module
proxy_connect_timeout
proxy_connect_timeout 60s;
http, server, location
Defines a timeout for establishing a connection with a proxied server. It should be noted that this timeout cannot usually exceed 75 seconds.
指定一个连接到代理服务器的超时时间，单位为秒，需要注意的是这个时间最好不要超过75秒。
ngx_http_proxy_module
proxy_read_timeout
proxy_read_timeout 60s;
http, server, location
Defines a timeout for reading a response from the proxied server. The timeout is set only between two successive read operations, not for the transmission of the whole response. If the proxied server does not transmit anything within this time, the connection is closed.
Sets a timeout for transmitting a request to the proxied server. The timeout is set only between two successive write operations, not for the transmission of the whole request. If the proxied server does not receive anything within this time, the connection is closed.
Sets the size of the buffer used for reading the first part of the response received from the proxied server. This part usually contains a small response header. By default, the buffer size is equal to one memory page. This is either 4K or 8K, depending on a platform. It can be made smaller, however.
Sets the number and size of the buffers used for reading a response from the proxied server, for a single connection. By default, the buffer size is equal to one memory page. This is either 4K or 8K, depending on a platform.
When buffering of responses from the proxied server is enabled, and the whole response does not fit into the buffers set by the proxy_buffer_size and proxy_buffers directives, a part of the response can be saved to a temporary file. This directive sets the maximum size of the temporary file. The size of data written to the temporary file at a time is set by the proxy_temp_file_write_size directive.The zero value disables buffering of responses to temporary files.
When buffering of responses from the proxied server is enabled, limits the total size of buffers that can be busy sending a response to the client while the response is not yet fully read. In the meantime, the rest of the buffers can be used for reading the response and, if needed, buffering part of the response to a temporary file. By default, size is limited by the size of two buffers set by the proxy_buffer_size and proxy_buffers directives.
Limits the size of data written to a temporary file at a time, when buffering of responses from the proxied server to temporary files is enabled. By default, size is limited by two buffers set by the proxy_buffer_size and proxy_buffers directives. The maximum size of a temporary file is set by the proxy_max_temp_file_size directive.
指定每次写temp file的大小
ngx_http_proxy_module
proxy_temp_path
proxy_temp_path proxy_temp;
http, server, location
Defines a directory for storing temporary files with data received from proxied servers. Up to three-level subdirectory hierarchy can be used underneath the specified directory. For example, in the following configuration
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