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HttpClient.DefaultProxy environment variable format #4315

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Sep 1, 2020
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HttpClient.DefaultProxy environment variable format #4315

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HttpClient.DefaultProxy environment variable format
kevinoid Jun 1, 2020
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kevinoid Jun 22, 2020
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9 changes: 6 additions & 3 deletions xml/System.Net.Http/HttpClient.xml
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Expand Up @@ -426,11 +426,14 @@ The default instance returned by this property will initialize following a diffe
* **For Linux:** Reads proxy configuration from environment variables or, in case those are not defined, this property initializes a non-configured instance that bypasses all addresses.

The environment variables used for `DefaultProxy` initialization on Windows and Unix-based platforms are:
* HTTP_PROXY: the hostname or IP address of the proxy server used on HTTP requests.
* HTTPS_PROXY: the hostname or IP address of the proxy server used on HTTPS requests.
* ALL_PROXY: the hostname or IP address of the proxy server used on HTTP and/or HTTPS requests in case HTTP_PROXY and/or HTTPS_PROXY are not defined.
* HTTP_PROXY: the proxy server used on HTTP requests.
* HTTPS_PROXY: the proxy server used on HTTPS requests.
* ALL_PROXY: the proxy server used on HTTP and/or HTTPS requests in case HTTP_PROXY and/or HTTPS_PROXY are not defined.
* NO_PROXY: a comma-separated list of hostnames that should be excluded from proxying.

On systems where environment variables are case-sensitive, the variable names may be all lowercase or all uppercase. The lowercase names are checked first.

The proxy server may be a hostname or IP address, optionally followed by a colon and port number, or it may be an http URL, optionally including a username and password for proxy authentication. The URL must be start with `http`, not `https`, and cannot include any text after the hostname, IP, or port.
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<exception cref="T:System.ArgumentNullException">The value passed cannot be <see langword="null" />.</exception>
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