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For a proxied POST endpoint, put proxy_request_buffering off; in the location that handles the request, then validate and reload NGINX:
location /upload/ {
proxy_request_buffering off;
proxy_pass http://backend;
}With request buffering disabled, NGINX forwards the body to the upstream as it receives it instead of waiting for the client to finish sending the entire body. The setting defaults to on and is available from NGINX 1.7.11 onward.
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When request buffering is enabled, NGINX reads the complete client request body before it starts sending that body to the proxied server. For a large upload or a slow client, the application may therefore see no body data until the upload has finished at the NGINX edge.
proxy_request_buffering off; changes that behavior for proxied requests. NGINX sends each portion of the request body upstream as it is received. This is useful for streaming uploads, long-running POST requests, and applications that need to begin processing before the client has transmitted the final byte.
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The directive affects the request flowing from the client to the upstream server. It does not control the response flowing back from the upstream to the client, and it does not apply to a request that NGINX serves locally rather than proxies.
Configure request streaming in the correct location
Scope the directive to the upload endpoint
The safest configuration is usually a dedicated location block. It limits the behavior to requests that actually need streaming and leaves normal endpoints with their existing buffering behavior.
http {
upstream backend {
server 127.0.0.1:8080;
}
server {
listen 80;
server_name example.test;
location /upload/ {
proxy_request_buffering off;
proxy_pass http://backend;
}
}
}After changing the file, test the generated configuration and reload the running process:
sudo nginx -t
sudo nginx -s reloadOn systems managed by systemd, sudo systemctl reload nginx performs the reload instead. A reload applies the new configuration to newly accepted requests without needlessly terminating existing workers.
Use broader scopes only deliberately
NGINX permits proxy_request_buffering in the http, server, or location context. An http-level value affects every matching proxied request unless a more specific block changes it. A server-level value affects all locations in that virtual server. A location-level value is normally easiest to audit because the endpoint’s behavior is visible next to its proxy_pass.
Do not assume that placing the directive in a parent block is enough. A nested, more-specific location can override it, and a request may match a different location than the one you edited. Always inspect the effective configuration and confirm the selected location when diagnosing unexpected buffering.
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Do not confuse request and response buffering
NGINX has two similarly named settings that operate in opposite directions. Changing the wrong one is a common reason an upload still appears to wait.
| Directive | Data direction | What it controls | Default | Typical use |
|---|---|---|---|---|
proxy_request_buffering |
Client to upstream | Whether NGINX reads the complete request body before forwarding it | on |
Set off for an endpoint that must stream a POST body upstream |
proxy_buffering |
Upstream to client | Whether NGINX buffers the response received from the proxied server | on |
Set off when the client must receive response data incrementally |
client_body_buffer_size |
Client request body inside NGINX | The memory buffer used while NGINX reads the body, including when data may spill to a temporary file | 8K or 16K, platform-dependent | Tune memory and temporary-file behavior; it is not the request-streaming switch |
proxy_buffering off; can be useful when the upstream itself produces a streaming response, such as progress events or generated output. It does not disable buffering of the incoming POST body. If the problem is that the upstream does not receive upload bytes until the client is done, the relevant setting is proxy_request_buffering off;.
Protocol and NGINX version caveats
Chunked HTTP/1.1 uploads
When a client uses HTTP/1.1 chunked transfer encoding, NGINX can still buffer the original request body even when proxy_request_buffering off; is set. NGINX’s documented behavior requires HTTP/1.1 or HTTP/2 to be enabled for proxying when you need the chunked body passed through without first being fully collected.
Check the protocol used on both sides of the proxy. A client connection using HTTP/1.1 does not by itself prove that the upstream connection is also using HTTP/1.1. Review the proxy configuration and capture request metadata in the application if the upstream sees a delayed body.
HTTP/2 request bodies on older NGINX releases
Before NGINX 1.9.14, HTTP/2 request-body buffering could not be disabled. An older installation can therefore ignore the behavior you expect even when the directive is present. Check the running binary’s version before troubleshooting application timing:
nginx -vUpgrade an installation older than 1.9.14 before relying on unbuffered HTTP/2 request bodies. The proxy_request_buffering directive itself was introduced in NGINX 1.7.11, so an even older release may not recognize it at all.
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Upstream failover changes after streaming starts
Once NGINX has started sending a request body to an upstream, it cannot hand that same request to a different upstream. Disabling request buffering therefore changes failover expectations: a backend that fails after receiving part of a body cannot be transparently replaced for the remainder of that request. Design retries at the application or upload-protocol layer when partial writes are possible.
client_body_buffer_size is a separate memory setting
client_body_buffer_size specifies the memory buffer NGINX uses while reading a client request body. The documented default is 8K or 16K, depending on platform. If a body exceeds the available buffer, some or all of it may be written to a temporary file.
Increasing this value does not make NGINX forward the body sooner. It changes how much memory can be used before temporary-file storage is involved. A larger value can reduce disk activity for certain request sizes, but it also increases the memory available to concurrent requests. Choose it only after considering concurrency, worker limits, and the capacity of the temporary-file filesystem.
Conversely, setting it very low does not guarantee streaming to the upstream; it can simply cause more request data to spill to disk while the proxy still waits for the complete body if request buffering remains enabled.
Apply and verify the change step by step
- Identify the exact endpoint. Record the URL path, HTTP method, virtual host, and upstream that handle the POST. Streaming should be enabled only where the application needs it.
- Find the matching location. Review prefix, exact-match, and regular-expression locations. A more-specific block can take precedence over a broad block that appears to contain the directive.
- Add the request directive. Place
proxy_request_buffering off;in the selected location, alongside the relevantproxy_pass. - Check the running version. Run
nginx -v. Confirm that the release supports the directive and, for HTTP/2 streaming, is at least 1.9.14. - Validate the complete configuration. Run
sudo nginx -t. Fix any syntax, include-file, or permission error before reloading. - Inspect the effective configuration. Run
sudo nginx -Tand search the output for the server and location handling the endpoint. This exposes included files and the configuration NGINX actually parses. - Reload NGINX. Use
sudo nginx -s reloadorsudo systemctl reload nginx. Editing a file without reloading leaves the old worker configuration active. - Test from the client side. Send a body slowly enough that a fully buffered proxy would noticeably delay the upstream. A test that uploads the entire body immediately cannot distinguish streaming from immediate buffering.
- Measure at the upstream. Log the time of the first received bytes and subsequent chunks in the application or upstream server. Client-side timing alone cannot prove when NGINX began forwarding the body.
Build a test that reveals buffering
Use a request body large or slow enough to create an observable interval. Send the first portion, pause, send another portion, and finish later. The upstream should log receipt of the first portion during the pause when request buffering is disabled.
Keep the test endpoint isolated from production data processing. Include a request identifier in the application log so that the client request, NGINX access entry, and upstream receipt events can be correlated. Record the protocol, request size, and timestamps for each run.
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If the upstream logs nothing until the final portion arrives, check the effective location and protocol before changing buffer sizes. Also verify that the application server is not doing its own request-body buffering; NGINX can forward bytes promptly while an upstream framework still waits for a complete body.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot when the upstream still waits
The directive is in the wrong block
Run nginx -T and locate the complete virtual-server configuration. Confirm that the request’s host and path select the block containing proxy_request_buffering off;. Pay particular attention to regex locations and nested locations that override inherited values.
NGINX was not reloaded
A successful file edit does not change running workers. Check the reload command’s result and, if necessary, inspect the process start or reload logs. Run nginx -t before retrying so a syntax error does not silently prevent the new configuration from loading.
The release or protocol prevents streaming
Check nginx -v and determine whether the request uses HTTP/1.1 chunked encoding or HTTP/2. Releases before 1.9.14 cannot disable HTTP/2 request-body buffering. Chunked requests also require appropriate HTTP/1.1 or HTTP/2 proxying behavior; otherwise NGINX may retain the original body.
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The wrong directive was changed
If you changed only proxy_buffering, you changed response handling. Restore or retain that setting according to the response requirements, but add proxy_request_buffering off; for the incoming upload path.
Temporary files or memory are the bottleneck
Review the filesystem used for NGINX client-body temporary files and the available memory when large bodies are accepted. client_body_buffer_size governs the in-memory portion and the point at which data can spill to disk; it does not replace request streaming configuration.
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The application buffers independently
Inspect the upstream framework, server, and upload middleware. Some applications intentionally parse or store the complete body before invoking business logic. In that case, NGINX may already be streaming correctly, but the application will not expose that fact until its own buffering layer is adjusted.
Decide whether to disable buffering globally
Endpoint-level configuration is generally easier to operate than disabling buffering for every proxied request. Request buffering can protect an upstream from slow clients by allowing NGINX to read and manage the body at the edge before occupying an application connection. Turning it off broadly can increase the time that upstream connections remain tied to slow uploads.
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Use a broader server or http scope only when all affected applications are designed for streaming and their connection, timeout, memory, and concurrency limits have been reviewed. Otherwise, keep the setting in the smallest location that satisfies the upload workflow.
Operational and reliability trade-offs
- Earlier processing: The upstream can begin consuming a body before the client finishes, reducing time to first byte at the application.
- Longer-lived upstream connections: A slow client can keep an upstream connection occupied for the duration of the upload.
- Reduced transparent failover: After body transmission starts, NGINX cannot move the request to another upstream.
- Resource planning: Review upstream concurrency, request timeouts, client limits, memory, and temporary-file capacity for the new traffic pattern.
- Security controls: Keep request-size, authentication, rate, and timeout policies appropriate for the endpoint; streaming does not remove those controls.
Common configuration patterns
Only uploads stream
server {
listen 80;
location /upload/ {
proxy_request_buffering off;
proxy_pass http://upload_backend;
}
location /api/ {
proxy_pass http://api_backend;
}
}Here, the upload path streams request bodies while the general API retains its existing request behavior.
Uploads stream and responses are incremental
location /stream-upload/ {
proxy_request_buffering off;
proxy_buffering off;
proxy_pass http://backend;
}This combination addresses both directions: the request body is sent upstream as received, and the upstream response is passed toward the client without normal response buffering. Use it only when the response really needs incremental delivery; disabling response buffering is not required merely to stream an incoming POST.
Quick Recap
Reference checklist
- Use
proxy_request_buffering off;for a proxied POST body that must reach the upstream while it is still arriving. - Put the directive in the matching
locationwhenever possible. - Do not substitute
proxy_buffering off;; that directive controls upstream responses. - Check NGINX version 1.7.11 or newer for the request directive and 1.9.14 or newer when disabling HTTP/2 request-body buffering.
- Investigate HTTP/1.1 chunked transfer behavior when NGINX still appears to collect the body.
- Treat
client_body_buffer_sizeas a memory and temporary-file setting, not a streaming control. - Validate with
nginx -t, inspect withnginx -T, reload, and measure first-byte arrival at the upstream. - Account for the loss of transparent upstream failover once body transmission has begun.
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