uwsgi_pass_header
The `uwsgi_pass_header` directive is used to specify headers passed from uWSGI applications to the client response.
Description
The uwsgi_pass_header directive is a configuration option in NGINX's uWSGI module that enables users to designate certain headers returned by the uWSGI application to be passed along to the client in the response. This directive can be specified in the http, server, or location contexts, allowing flexible configurations across different parts of an NGINX server. The argument for this directive is a single header name, which must match the header name that the uWSGI application includes in its response.
When using the uwsgi_pass_header directive, only the specified headers will be forwarded to the client, which can help control what information is exposed and ensure that relevant headers are consistently sent back. This is particularly useful for headers that convey application-specific data, such as version information, security tokens, or custom application status messages. By selectively passing headers, administrators can improve security and reduce unnecessary data transmission.
If multiple headers need to be passed, the uwsgi_pass_header directive can be declared multiple times within the same configuration block, each specifying a different header to forward. The overall behavior is dependent on the configuration of the uWSGI server as well, ensuring that the specified headers are actually present in the response before NGINX attempts to forward them to the client.
Config Example
location /app {
include uwsgi_params;
uwsgi_pass my_app;
uwsgi_pass_header X-My-Custom-Header;
}Ensure that the header name specified is exactly as it appears in the uWSGI response, including case sensitivity.
If a header is not set by the uWSGI application, it will not be available to pass via uwsgi_pass_header, potentially leading to confusion.