I solved the problem by disabling "fastcgi_buffering" or increasing fastcgi_buffer_size. Before nginx uses default buffer size and it failed. It seems irrelevant to ssi but ssi somehow trigger the error. But still I don't know why there was multiple empty response. Can anybody have any explanation about this?by junlin.chen - Other discussion
It seems works fine when the output size is small. but it will occur in some probability when the output size (about 14000 k) is big, The probability of occurrence is about 40% ~ 50%. Below is relative info. error_log sample ``` 6#6: *130 header already sent while sending response to client, client: xxx, server: xxx, request: "GET /my-page HTTP/1.1", subrequest: "xxxhtml&quby junlin.chen - Other discussion