How to get Original response before gzip or another module filter rewrite response

[hack988]

 Dear All:
    I'm a beginner for nginx development,Although i'm read Emiller's Guide and another article about Nginx develop for several days,I still don't know how to read whole original response buffer chain copy to myself module's temporary buffer,before another module(gzip,gunzip,gzip_static) rewrite buffer.
How to check another module is written output buffer to diffrent content type?
I want to copy buffer to a file that no compress or chunked.
I'm sorry for my  poor english ,thx.
 


hack988
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