Doesn't work for me. I set an variable, but it seems that nginx can't resolve it if used in proxy_pass directive. In proxy_redirect the same variable works as expected. – shylynx Feb 10 '14 at 10:43

Jan 22, 2018 In statistics, a proxy or proxy variable is a variable that is not in itself directly relevant, but that serves in place of an unobservable or immeasurable variable. In order for a variable to be a good proxy, it must have a close correlation, not necessarily linear, with the variable of interest. This correlation might be either positive or negative. A variable used instead of the variable of interest when that variable of interest cannot be measured directly. For example, per capita GDP can be used as a proxy for the standard of living. See also latent variable. From: proxy variable in A Dictionary of Economics » A proxy variable is a variable that is used to measure an unobservable quantity of interest. Although a proxy variable is not a direct measure of the desired quantity, a good proxy variable is strongly related to Looks like you do not have access to this content. A proxy approximates another (usually unobservable) value. For instance, university admissions use test scores to proxy intelligence. Intelligence is objectively very difficult to talk about on the margin, whereas test scores are a very simple, quantifiable thing. Test scores approximate intelligence. Test scores proxy intelligence. This first type of proxy is similar in spirit to Wooldridge’s (2010) definition of proxy variables. A proxy variable of Type I is an irrelevant variable for explaining the potential outcomes given the confounders X;U (Assumption 3i-ii)). A variable irrelevant for the outcome is useful for identification (see

How to Set the http_proxy Variable in Linux - Putorius

`no_proxy' This variable should contain a comma-separated list of domain extensions proxy should _not_ be used for. For instance, if the value of `no_proxy' is `.mit.edu', proxy will not be used to retrieve documents from MIT. So the variable should contain a list of domains, not IP ranges. GNU Wget 1.18 Manual: Proxies The standard way to specify proxy location, which Wget recognizes, is using the following environment variables: http_proxy https_proxy. If set, the http_proxy and https_proxy variables should contain the URLs of the proxies for HTTP and HTTPS connections respectively. ftp_proxy. This variable should contain the URL of the proxy for FTP connections What is the difference between an instrumental variable

Conditions 2 and 3 can accommodate both categorical and continuous confounders. For a categorical confounder with categorical proxy variables, Conditions 2 and 3 are equivalent to Condition 1.

GNU Wget 1.18 Manual: Proxies The standard way to specify proxy location, which Wget recognizes, is using the following environment variables: http_proxy https_proxy. If set, the http_proxy and https_proxy variables should contain the URLs of the proxies for HTTP and HTTPS connections respectively. ftp_proxy. This variable should contain the URL of the proxy for FTP connections What is the difference between an instrumental variable