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I think i already tried what you suggested, but that doesn't work because i have to set a specific protocol in the proxy_pass command (http or https). If i have a mixed upstream group like
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upstream proxy_backend {</div>
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server xxx.xx.188.53;</div>
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server xxx.xx.188.53:443;</div>
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}</div>
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i always get protocol errors like 502 or 400 because i cannot switch between http and https in the proxy_pass command</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>Von:</b> nginx <nginx-bounces@nginx.org> im Auftrag von B.R. via nginx <nginx@nginx.org><br>
<b>Gesendet:</b> Mittwoch, 22. Februar 2017 18:52:00<br>
<b>An:</b> nginx ML<br>
<b>Cc:</b> B.R.<br>
<b>Betreff:</b> Re: Nginx multiple upstream with different protocols</font>
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<div class="gmail_default" style="font-size:small;color:rgb(51,51,153)">I suggest you proxy traffic to an upstream group, and then use failure/timeout parameters there with proper tuning to retry requests on the second upstream in case the first in the list
fails.<br>
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<div style="font-size:small;color:rgb(51,51,153)" class="gmail_default">It will have an overhead if the 1st entry of the upstream group is invalid on initial connection, but hopefully the 'down' status will help limiting that overhead on average.</div>
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<div class="gmail_signature" data-smartmail="gmail_signature"><font size="1"><span style="color:rgb(102,102,102)">---<br>
</span><b><span style="color:rgb(102,102,102)">B. R.</span></b><span style="color:rgb(102,102,102)"></span></font></div>
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<div class="gmail_quote">On Wed, Feb 22, 2017 at 5:08 PM, Kilian Ries <span dir="ltr">
<<a href="mailto:mail@kilian-ries.de" target="_blank">mail@kilian-ries.de</a>></span> wrote:<br>
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<p>No they cannot be the same (sadly) because i dont't know how the upstream is serving the content. Think of a situation where i am not in control of the upstream backends and they may change from http to https over time.</p>
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<div id="m_-1893229326221018781divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" color="#000000" face="Calibri, sans-serif"><b>Von:</b> nginx <<a href="mailto:nginx-bounces@nginx.org" target="_blank">nginx-bounces@nginx.org</a>> im Auftrag von Cox, Eric
S <<a href="mailto:eric.cox@kroger.com" target="_blank">eric.cox@kroger.com</a>><br>
<b>Gesendet:</b> Mittwoch, 22. Februar 2017 15:58:26<br>
<b>An:</b> <a href="mailto:nginx@nginx.org" target="_blank">nginx@nginx.org</a><br>
<b>Betreff:</b> RE: Nginx multiple upstream with different protocols</font>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">If you are SSL on the frontend (server directive) why would you want to proxy between ssl/non-ssl on the upstreams? Can they not be the same? I don’t get what
you are trying to solve?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> nginx [mailto:<a href="mailto:nginx-bounces@nginx.org" target="_blank">nginx-bounces@nginx.<wbr>org</a>]
<b>On Behalf Of </b>Kilian Ries<br>
<b>Sent:</b> Wednesday, February 22, 2017 9:55 AM<br>
<b>To:</b> <a href="mailto:nginx@nginx.org" target="_blank">nginx@nginx.org</a><br>
<b>Subject:</b> Nginx multiple upstream with different protocols<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p><span style="font-family:"Calibri","sans-serif";color:black">Hi,<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"><u></u> <u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black">i'm trying to setup two Nginx upstreams (one with HTTP and one with HTTPS) and the proxy_pass module should decide which of the upstreams is serving "valid" content.<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"><u></u> <u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black">The config should look like this:<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"><u></u> <u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black">upstream proxy_backend {<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"> server xxx.xx.188.53;<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"> server xxx.xx.188.53:443;<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black">}<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"><u></u> <u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black">server {<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"> listen 443 ssl;<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"> ...<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"> location / {<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"> proxy_pass
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__proxy-5Fbackend&d=DwMFAw&c=WUZzGzAb7_N4DvMsVhUlFrsw4WYzLoMP5bgx2U7ydPE&r=20GRp3QiDlDBgTH4mxQcOIMPCXcNvWGMx5Y0qmfF8VE&m=ggR0dMpbDQRqzdhj1Aoq_FUpo8iYplzYiTPyRlQMs9Y&s=wcDWb0xGOKhBVtan1kM5-AVvxNT0ZMnUT9r-yLbyjAQ&e=" id="m_-1893229326221018781LPlnk114613" target="_blank">
http://proxy_backend</a>;<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"> #proxy_pass
<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__proxy-5Fbackend&d=DwMFAw&c=WUZzGzAb7_N4DvMsVhUlFrsw4WYzLoMP5bgx2U7ydPE&r=20GRp3QiDlDBgTH4mxQcOIMPCXcNvWGMx5Y0qmfF8VE&m=ggR0dMpbDQRqzdhj1Aoq_FUpo8iYplzYiTPyRlQMs9Y&s=ztdy1u_d7Ag0QPBnpk1R-LazdfexcrTnljKLZet4VFA&e=" id="m_-1893229326221018781LPlnk248790" target="_blank">
https://proxy_backend</a>;<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"> }<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"> }<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"><u></u> <u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"><u></u> <u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black">The Problem is that i don't know if the upstream is serving the content via http or https. Is there any possibility to tell nginx to change the protocol from the proxy_pass directive? Because if
i set proxy_pass to https, i get an error (502 / 400) if the upstream website is running on http and vice versa.<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"><u></u> <u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black">So i'm searching for a way to let Nginx decide if he should proxy_pass via http or https. Can anybody help me with that configuration?<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black"><u></u> <u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black">Thanks <u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black">Greets<u></u><u></u></span></p>
<p><span style="font-family:"Calibri","sans-serif";color:black">Kilian<u></u><u></u></span></p>
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