HTTP to HTTPS Behind Elastic Load Balancer in AWS

In the most common configurations, when running your web app behind ​Nginx or Apache, ​your https:// request will get redirected to ​http://. Sometimes, you may want to rewrite all HTTP requests to HTTPS.

The Amazon Elastic Load Balancer (ELB) supports a HTTP header called X-FORWARDED-PROTO. All the HTTPS requests going through the ELB will have the value of X-FORWARDED-PROTO equal to “HTTPS”. For the HTTP requests, you can force HTTPS by adding a simple rewrite rule, as follows:

1. Nginx

In your nginx site config file check if the value of X_FORWARDED_PROTO is https, if not, rewrite it:

server {
    listen 80;
    location / {
        if ($http_x_forwarded_proto != 'https') {
            rewrite ^ https://$host$request_uri? permanent;

2. Apache

Same goes for Apache, add this rewrite rule to your site’s config file:

RewriteEngine On
RewriteCond %{HTTP:X-Forwarded-Proto} !https
RewriteRule ^.*$ https://%{SERVER_NAME}%{REQUEST_URI}

3. IIS

Install IIS Url-Rewrite module, using the configuration GUI add these settings

<rewrite xdt:Transform="Insert">
<rule name="HTTPS rewrite behind ELB rule" stopProcessing="true">
<match url="^(.*)$" ignoreCase="false" />
<add input="{HTTP_X_FORWARDED_PROTO}" pattern="^http$" ignoreCase="false" />
<action type="Redirect" redirectType="Found" url="https://{SERVER_NAME}{URL}" />

4. HAProxy
frontend node1-https
bind ssl crt /etc/ssl/cert.pem
mode http
maxconn 50000
option httpclose
option forwardfor
reqadd X-Forwarded-Proto: https

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