Hello!

On Fri, Apr 13, 2012 at 09:58:14PM +0200, Samuel ROZE wrote:

> Hello,
>
> I'm writing an nginx module but I've got a problem for getting
> response headers. It's using an NGX_HTTP_LOG_PHASE handler and I want
> to have access to response headers sent to client. (with or without
> proxy_pass)
>
> And, in fact, the headers_out variable of request isn't really
> completed. When debugging module using gdb, in the log phase handler,
> the headers_out variable is always like that:
>
> headers_out = {
> headers = {
> last = 0x1ed5530,
> part = {
> elts = 0x1ec6250,
> nelts = 1,
> next = 0x0
> },
> size = 48,
> nalloc = 20,
> pool = 0x1ec6200
> },
> status = 304,
> status_line = {
> len = 0,
> data = 0x0
> },
> server = 0x0,
> date = 0x0,
> content_length = 0x0,
> content_encoding = 0x0,
> location = 0x0,
> refresh = 0x0,
> last_modified = 0x0,
> content_range = 0x0,
> accept_ranges = 0x0,
> www_authenticate = 0x0,
> expires = 0x0,
> etag = 0x0,
> override_charset = 0x0,
> content_type_len = 9,
> content_type = {
> len = 0,
> data = 0x1ed1248 "text/html"
> },
> charset = {
> len = 0,
> data = 0x0
> },
> content_type_lowcase = 0x0,
> content_type_hash = 0,
> cache_control = {
> elts = 0x0,
> nelts = 0,
> size = 0,
> nalloc = 0,
> pool = 0x0
> },
> content_length_n = -1,
> date_time = 0,
> last_modified_time = 1334219772
> },
>
> The headers_out array is containing the only request that I added
> using "add_header" in location, and the "server", "date", etc...
> variables are empty.
>
> Do you know why there isn't any value in headers_out structure? And do
> you know how can I get these headers?

The "Server", "Date", "Content-Length", "Last-Modified" and other
standard headers aren't normally exists in r->headers_out for
nginx's own responses, they are instead constructed on the fly in
ngx_http_header_filter.c.

The r->headers_out structure either hold needed data (as
last_modified_time for the "Last-Modified" header) or just nothing
(as for the "Date" header, as it just uses current time).

Maxim Dounin

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