docs: this is for 7.37.0

And clarify for curl that --proxy-header now must be used for headers
that are meant for a proxy, and they will not be included if the request
is not for a proxy.

docs/curl.1

@@ -678,16 +678,16 @@ If this option is used several times, only the first one is used. This is
 because undoing a GET doesn't make sense, but you should then instead enforce
 the alternative method you prefer.
 .IP "-H, --header <header>"
-(HTTP) Extra header to use when getting a web page. You may specify any number
+(HTTP) Extra header to include in the request when sending HTTP to a
-of extra headers. Note that if you should add a custom header that has the
+server. You may specify any number of extra headers. Note that if you should
-same name as one of the internal ones curl would use, your externally set
+add a custom header that has the same name as one of the internal ones curl
-header will be used instead of the internal one. This allows you to make even
+would use, your externally set header will be used instead of the internal
-trickier stuff than curl would normally do. You should not replace internally
+one. This allows you to make even trickier stuff than curl would normally
-set headers without knowing perfectly well what you're doing. Remove an
+do. You should not replace internally set headers without knowing perfectly
-internal header by giving a replacement without content on the right side of
+well what you're doing. Remove an internal header by giving a replacement
-the colon, as in: -H \&"Host:". If you send the custom header with no-value
+without content on the right side of the colon, as in: -H \&"Host:". If you
-then its header must be terminated with a semicolon, such as \-H
+send the custom header with no-value then its header must be terminated with a
-\&"X-Custom-Header;" to send "X-Custom-Header:".
+semicolon, such as \-H \&"X-Custom-Header;" to send "X-Custom-Header:".
 
 curl will make sure that each header you add/replace is sent with the proper
 end-of-line marker, you should thus \fBnot\fP add that as a part of the header
@@ -696,6 +696,9 @@ for you.
 
 See also the \fI-A, --user-agent\fP and \fI-e, --referer\fP options.
 
+Starting in 7.37.0, you need \fI--proxy-header\fP to send custom headers
+intended for a proxy.
+
 This option can be used multiple times to add/replace/remove multiple headers.
 .IP "--hostpubmd5 <md5>"
 (SCP/SFTP) Pass a string containing 32 hexadecimal digits. The string should
@@ -1108,20 +1111,23 @@ The Bearer Token and user name are formatted according to RFC 6750.
 
 If this option is used several times, the last one will be used.
 .IP "--proxy-header <header>"
-(HTTP) Extra header to use when getting a web page with a proxy. You may
+(HTTP) Extra header to include in the request when sending HTTP to a
-specify any number of extra headers. This is the equivalent option to \fI-H,
+proxy. You may specify any number of extra headers. This is the equivalent
---header\fP but is for proxy communication only like in CONNECT requests when
+option to \fI-H, --header\fP but is for proxy communication only like in
-you want a separate header sent to the proxy to what is sent to the actual
+CONNECT requests when you want a separate header sent to the proxy to what is
-remote host.
+sent to the actual remote host.
 
 curl will make sure that each header you add/replace is sent with the proper
 end-of-line marker, you should thus \fBnot\fP add that as a part of the header
 content: do not add newlines or carriage returns, they will only mess things
 up for you.
 
+Headers specified with this option will not be included in requests that curl
+knows will not be sent to a proxy.
+
 This option can be used multiple times to add/replace/remove multiple headers.
 
-(Added in 7.36.0)
+(Added in 7.37.0)
 .IP "-p, --proxytunnel"
 When an HTTP proxy is used (\fI-x, --proxy\fP), this option will cause non-HTTP
 protocols to attempt to tunnel through the proxy instead of merely using it to

docs/libcurl/symbols-in-versions

@@ -193,8 +193,8 @@ CURLFTP_CREATE_DIR_RETRY        7.19.4
 CURLGSSAPI_DELEGATION_FLAG      7.22.0
 CURLGSSAPI_DELEGATION_NONE      7.22.0
 CURLGSSAPI_DELEGATION_POLICY_FLAG 7.22.0
-CURLHEADER_SEPARATE             7.36.0
+CURLHEADER_SEPARATE             7.37.0
-CURLHEADER_UNIFIED              7.36.0
+CURLHEADER_UNIFIED              7.37.0
 CURLINFO_APPCONNECT_TIME        7.19.0
 CURLINFO_CERTINFO               7.19.1
 CURLINFO_CONDITION_UNMET        7.19.4
@@ -372,7 +372,7 @@ CURLOPT_GSSAPI_DELEGATION       7.22.0
 CURLOPT_HEADER                  7.1
 CURLOPT_HEADERDATA              7.10
 CURLOPT_HEADERFUNCTION          7.7.2
-CURLOPT_HEADEROPT               7.36.0
+CURLOPT_HEADEROPT               7.37.0
 CURLOPT_HTTP200ALIASES          7.10.3
 CURLOPT_HTTPAUTH                7.10.6
 CURLOPT_HTTPGET                 7.8.1
@@ -442,7 +442,7 @@ CURLOPT_PROGRESSFUNCTION        7.1           7.32.0
 CURLOPT_PROTOCOLS               7.19.4
 CURLOPT_PROXY                   7.1
 CURLOPT_PROXYAUTH               7.10.7
-CURLOPT_PROXYHEADER             7.36.0
+CURLOPT_PROXYHEADER             7.37.0
 CURLOPT_PROXYPASSWORD           7.19.1
 CURLOPT_PROXYPORT               7.1
 CURLOPT_PROXYTYPE               7.10