http://nginx.org/en/docs/http/ngx_http_core_module.html#client_body_buffer_size
该地址对于client_body_buffer_size配置做了说明
syntax: client_body_buffer_size size
default: client_body_buffer_size 8k|16k
context: http,server,location
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.
为读取客户端请求体设置缓存区大小。为了防止请求体超过缓存区大小,将整个请求体或其中一分部写入一个临时文件。默认缓存区大小为two memory pages。在x86、32位机器、x86-64上是8k,其它64位机器上是16k。
解决方案有两种:
1、调大client_body_buffer_size值
client_body_buffer_size 128k
client_max_body_size 100m
这两个参数配合使用,如果总body_size超过这个值,请求会被拒绝
2、去临时文件读取请求体
需要用到ngx.req.get_body_file,从临时文件读取数据
--Nginx服务器中使用lua获取get或post参数 local request_method = ngx.var.request_method local args = nil local param = nil local param2 = nil --获取参数的值 if "GET" == request_method then args = ngx.req.get_uri_args() elseif "POST" == request_method then ngx.req.read_body() args = ngx.req.get_post_args() end param = args["param"] param2 = args["param2"] --升级版(能处理content-type=multipart/form-data的表单): local function explode ( _str,seperator ) local pos, arr = 0, {} for st, sp in function() return string.find( _str, seperator, pos, true ) end do table.insert( arr, string.sub( _str, pos, st-1 ) ) pos = sp + 1 end table.insert( arr, string.sub( _str, pos ) ) return arr end local args = {} local file_args = {} local is_have_file_param = false local function init_form_args() local receive_headers = ngx.req.get_headers() local request_method = ngx.var.request_method if "GET" == request_method then args = ngx.req.get_uri_args() elseif "POST" == request_method then ngx.req.read_body() --判断是否是multipart/form-data类型的表单 if string.sub(receive_headers["content-type"],1,20) == "multipart/form-data;" then is_have_file_param = true content_type = receive_headers["content-type"] --body_data可是符合http协议的请求体,不是普通的字符串 body_data = ngx.req.get_body_data() --请求体的size大于nginx配置里的client_body_buffer_size,则会导致请求体被缓冲到磁盘临时文件里,client_body_buffer_size默认是8k或者16k if not body_data then local datafile = ngx.req.get_body_file() if not datafile then error_code = 1 error_msg = "no request body found" else local fh, err = io.open(datafile, "r") if not fh then error_code = 2 error_msg = "failed to open " .. tostring(datafile) .. "for reading: " .. tostring(err) else fh:seek("set") body_data = fh:read("*a") fh:close() if body_data == "" then error_code = 3 error_msg = "request body is empty" end end end end local new_body_data = {} --确保取到请求体的数据 if not error_code then local boundary = "--" .. string.sub(receive_headers["content-type"],31) local body_data_table = explode(tostring(body_data),boundary) local first_string = table.remove(body_data_table,1) local last_string = table.remove(body_data_table) for i,v in ipairs(body_data_table) do local start_pos,end_pos,capture,capture2 = string.find(v,'Content%-Disposition: form%-data; name="(.+)"; filename="(.*)"') --普通参数 if not start_pos then local t = explode(v,"rnrn") local temp_param_name = string.sub(t[1],41,-2) local temp_param_value = string.sub(t[2],1,-3) args[temp_param_name] = temp_param_value else --文件类型的参数,capture是参数名称,capture2是文件名 file_args[capture] = capture2 table.insert(new_body_data,v) end end table.insert(new_body_data,1,first_string) table.insert(new_body_data,last_string) --去掉app_key,app_secret等几个参数,把业务级别的参数传给内部的API body_data = table.concat(new_body_data,boundary)--body_data可是符合http协议的请求体,不是普通的字符串 end else args = ngx.req.get_post_args() end end end