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ngx_int_t ngx_http_upstream_header_variable(ngx_http_request_t *r,
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ngx_http_variable_value_t *v, uintptr_t data);
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void ngx_http_upstream_init(ngx_http_request_t *r);
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ngx_http_upstream_srv_conf_t *ngx_http_upstream_add(ngx_conf_t *cf,
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ngx_url_t *u, ngx_uint_t flags);