From 0b5062a6add3faa15b4dfdbce055e0ed0617c466 Mon Sep 17 00:00:00 2001 From: Francis Lavoie Date: Fri, 8 Jul 2022 04:19:59 -0400 Subject: [PATCH] docs: Changes for v2.5.2 release --- src/docs/markdown/api.md | 7 +- src/docs/markdown/caddyfile/concepts.md | 1 + .../markdown/caddyfile/directives/error.md | 2 +- .../caddyfile/directives/forward_auth.md | 48 +++-- .../caddyfile/directives/handle_errors.md | 8 +- .../markdown/caddyfile/directives/header.md | 25 ++- .../caddyfile/directives/request_header.md | 15 +- .../caddyfile/directives/reverse_proxy.md | 166 ++++++++++++++---- src/docs/markdown/caddyfile/matchers.md | 2 +- src/docs/markdown/caddyfile/options.md | 4 +- src/docs/markdown/command-line.md | 5 +- src/docs/markdown/v2-upgrade.md | 2 +- 12 files changed, 221 insertions(+), 64 deletions(-) diff --git a/src/docs/markdown/api.md b/src/docs/markdown/api.md index 7607a5b..0d404b7 100644 --- a/src/docs/markdown/api.md +++ b/src/docs/markdown/api.md @@ -278,15 +278,14 @@ Returns the current status of the configured reverse proxy upstreams (backends) 
curl "http://localhost:2019/reverse_proxy/upstreams" | jq
 [
-	{"address": "10.0.1.1:80", "healthy": true, "num_requests": 4, "fails": 2},
-	{"address": "10.0.1.2:80", "healthy": true, "num_requests": 5, "fails": 4},
-	{"address": "10.0.1.3:80", "healthy": true, "num_requests": 3, "fails": 3}
+	{"address": "10.0.1.1:80", "num_requests": 4, "fails": 2},
+	{"address": "10.0.1.2:80", "num_requests": 5, "fails": 4},
+	{"address": "10.0.1.3:80", "num_requests": 3, "fails": 3}
 ]
Each entry in the JSON array is a configured [upstream](/docs/json/apps/http/servers/routes/handle/reverse_proxy/upstreams/) stored in the global upstream pool. - **address** is the dial address of the upstream. For SRV upstreams, this is the `lookup_srv` DNS name. -- **healthy** reflects whether Caddy believes the upstream to be healthy or not. Note that "health" is a distinct concept from "availability". An unhealthy backend will always be unavailable, but a healthy backend might not be available. Health is a global characteristic regardless of specific reverse proxy handler configuration, whereas availability is determined by the configuration of the specific reverse proxy handler. For example, a healthy backend would be unavailable if the handler is configured to only allow N requests at a time and it currently has N active requests. The "healthy" property does not reflect availability. - **num_requests** is the amount of active requests currently being handled by the upstream. - **fails** the current number of failed requests remembered, as configured by passive health checks. diff --git a/src/docs/markdown/caddyfile/concepts.md b/src/docs/markdown/caddyfile/concepts.md index f35092a..e7cfef1 100644 --- a/src/docs/markdown/caddyfile/concepts.md +++ b/src/docs/markdown/caddyfile/concepts.md @@ -258,6 +258,7 @@ You can use any [Caddy placeholders](/docs/conventions#placeholders) in the Cadd | `{upstream_hostport}` | `{http.reverse_proxy.upstream.hostport}` | | `{rp.*}` | `{http.reverse_proxy.*}` | | `{vars.*}` | `{http.vars.*}` | +| `{err.*}` | `{http.error.*}` | diff --git a/src/docs/markdown/caddyfile/directives/error.md b/src/docs/markdown/caddyfile/directives/error.md index 5cf9833..e50f250 100644 --- a/src/docs/markdown/caddyfile/directives/error.md +++ b/src/docs/markdown/caddyfile/directives/error.md @@ -37,7 +37,7 @@ example.com { # Handle the error by serving an HTML page handle_errors { - rewrite * /{http.error.status_code}.html + rewrite * /{err.status_code}.html file_server } diff --git a/src/docs/markdown/caddyfile/directives/forward_auth.md b/src/docs/markdown/caddyfile/directives/forward_auth.md index 95ca55a..50c35e7 100644 --- a/src/docs/markdown/caddyfile/directives/forward_auth.md +++ b/src/docs/markdown/caddyfile/directives/forward_auth.md @@ -9,6 +9,8 @@ An opinionated directive which proxies a clone of the request to an authenticati - [Syntax](#syntax) - [Expanded Form](#expanded-form) - [Examples](#examples) + - [Authelia](#authelia) + - [Tailscale](#tailscale) Caddy's [`reverse_proxy`](/docs/caddyfile/directives/reverse_proxy) is capable of performing "pre-check requests" to an external service, but this directive is tailored specifically for the authentication usecase. This directive is actually just a convenient way to use a longer, more common configuration (below). @@ -26,14 +28,22 @@ All the subdirectives of [`reverse_proxy`](/docs/caddyfile/directives/reverse_pr ```caddy-d forward_auth [] [] { uri - copy_headers + copy_headers { + + } } ``` - **<upstreams...>** is a list of upstreams (backends) to which to send auth requests. + - **uri** is the URI (path and query) to set on the request sent to the upstream. This will usually be the verification endpoint of the authentication gateway. + - **copy_headers** is a list of HTTP header fields to copy from the response to the original request, when the request has a success status code. + The field can be renamed by using `>` followed by the new name, for example `Before>After`. + + A block may be used to list all the fields, one per line, if you prefer for readability. + Since this directive is an opinionated wrapper over a reverse proxy, you can use any of [`reverse_proxy`](/docs/caddyfile/directives/reverse_proxy#syntax)'s subdirectives to customize it. @@ -67,20 +77,15 @@ reverse_proxy { Remote-Email {rp.header.Remote-Email} } } - - # On a failed response, copy the response back to - # the client, with some hop-by-hop headers removed - handle_response { - copy_response_headers { - exclude Connection Keep-Alive Te Trailers Transfer-Encoding Upgrade - } - copy_response - } } ``` + ## Examples + +### Authelia + Delegating authentication to [Authelia](https://www.authelia.com/), before serving your app via a reverse proxy: ```caddy @@ -99,3 +104,26 @@ app1.example.com { reverse_proxy app1:8080 } ``` + +For more information, see [Authelia's documentation](https://www.authelia.com/integration/proxies/caddy/) for integrating with Caddy. + + +### Tailscale + +Delegation authentication to [Tailscale](https://tailscale.com/) (currently named [`nginx-auth`](https://tailscale.com/blog/tailscale-auth-nginx/), but it still works with Caddy), and using the alternative syntax for `copy_headers` to rename the copied headers: + +```caddy-d +forward_auth unix//run/tailscale.nginx-auth.sock { + uri /auth + header_up Remote-Addr {remote_host} + header_up Remote-Port {remote_port} + header_up Original-URI {uri} + copy_headers { + Tailscale-User>X-Webauth-User + Tailscale-Name>X-Webauth-Name + Tailscale-Login>X-Webauth-Login + Tailscale-Tailnet>X-Webauth-Tailnet + Tailscale-Profile-Picture>X-Webauth-Profile-Picture + } +} +``` diff --git a/src/docs/markdown/caddyfile/directives/handle_errors.md b/src/docs/markdown/caddyfile/directives/handle_errors.md index 198ee2c..7231f1b 100644 --- a/src/docs/markdown/caddyfile/directives/handle_errors.md +++ b/src/docs/markdown/caddyfile/directives/handle_errors.md @@ -33,7 +33,7 @@ Custom error pages based on the status code (i.e. a page called `404.html` for 4 ```caddy-d handle_errors { - rewrite * /{http.error.status_code}.html + rewrite * /{err.status_code}.html file_server } ``` @@ -52,7 +52,7 @@ Reverse proxy to a professional server that is highly qualified for handling HTT ```caddy-d handle_errors { - rewrite * /{http.error.status_code} + rewrite * /{err.status_code} reverse_proxy https://http.cat { header_up Host http.cat } @@ -63,7 +63,7 @@ Simply use [`respond`](/docs/caddyfile/directives/respond) to return the error c ```caddy-d handle_errors { - respond "{http.error.status_code} {http.error.status_text}" + respond "{err.status_code} {err.status_text}" } ``` @@ -71,7 +71,7 @@ To handle specific error codes differently, use an [`expression`](/docs/caddyfil ```caddy-d handle_errors { - @4xx expression `{http.error.status_code} >= 400 && {http.error.status_code} < 500` + @4xx expression `{err.status_code} >= 400 && {err.status_code} < 500` respond @4xx "It's a 4xx error!" respond "It's not a 4xx error." diff --git a/src/docs/markdown/caddyfile/directives/header.md b/src/docs/markdown/caddyfile/directives/header.md index e36e92f..90025a4 100644 --- a/src/docs/markdown/caddyfile/directives/header.md +++ b/src/docs/markdown/caddyfile/directives/header.md @@ -12,20 +12,37 @@ By default, header operations are performed immediately unless any of the header ## Syntax ```caddy-d -header [] [[+|-|?] [||] []] { +header [] [[+|-|?] [|] []] { + # Replace + + # Add or Set [+] + + # Delete - - ? + + # Default + ? + [defer] } ``` -- **<field>** is the name of the header field. By default, will overwrite any existing field of the same name. Prefix with `+` to add the field instead of replace, or prefix with `-` to remove the field. +- **<field>** is the name of the header field. By default, will overwrite any existing field of the same name. + + Prefix with `+` to add the field instead of overwriting (setting) the field if it already exists; header fields can appear more than once in a request. + + Prefix with `-` to delete the field. The field may use prefix or suffix `*` wildcards to delete all matching fields. + + Prefix with `?` to set a default value for the field. The field is only written if it doesn't yet exist. + - **<value>** is the header field value, if adding or setting a field. -- **<default_value>** is the header field value that will be set only if the header does not already exist. + - **<find>** is the substring or regular expression to search for. + - **<replace>** is the replacement value; required if performing a search-and-replace. + - **defer** will force the header operations to be deferred until the response is being written out to the client. This is automatically enabled if any of the header fields are being deleted with `-`, or when setting a default value with `?`. For multiple header manipulations, you can open a block and specify one manipulation per line in the same way. diff --git a/src/docs/markdown/caddyfile/directives/request_header.md b/src/docs/markdown/caddyfile/directives/request_header.md index f6beaa4..6e7acfa 100644 --- a/src/docs/markdown/caddyfile/directives/request_header.md +++ b/src/docs/markdown/caddyfile/directives/request_header.md @@ -13,9 +13,16 @@ Manipulates HTTP header fields on the request. It can set, add, and delete heade request_header [] [[+|-] [|] []] ``` -- **<field>** is the name of the header field. By default, will overwrite any existing field of the same name. Prefix with `+` to add the field instead of replace, or prefix with `-` to remove the field. +- **<field>** is the name of the header field. By default, will overwrite any existing field of the same name. + + Prefix with `+` to add the field instead of overwriting (setting) the field if it already exists; header fields can appear more than once in a request. + + Prefix with `-` to delete the field. The field may use prefix or suffix `*` wildcards to delete all matching fields. + - **<value>** is the header field value, if adding or setting a field. + - **<find>** is the substring or regular expression to search for. + - **<replace>** is the replacement value; required if performing a search-and-replace. @@ -26,3 +33,9 @@ Remove the Referer header from the request: ```caddy-d request_header -Referer ``` + +Delete all headers containing an underscore from the request: + +```caddy-d +request_header -*_* +``` diff --git a/src/docs/markdown/caddyfile/directives/reverse_proxy.md b/src/docs/markdown/caddyfile/directives/reverse_proxy.md index 9af4083..47e4589 100644 --- a/src/docs/markdown/caddyfile/directives/reverse_proxy.md +++ b/src/docs/markdown/caddyfile/directives/reverse_proxy.md @@ -145,7 +145,7 @@ Additionally, upstream addresses cannot contain paths or query strings, as that If the address is not a URL (i.e. does not have a scheme), then placeholders can be used, but this makes the upstream _dynamically static_, meaning that potentially many different backends act as a single, static upstream in terms of health checks and load balancing. -When proxying over HTTPS, you may need to override the `Host` header such that it matches the TLS SNI value, which is used by servers for routing and certificate selection. See the [Headers](#headers) section below for more details. +When proxying over HTTPS, you may need to override the `Host` header such that it matches the TLS SNI value, which is used by servers for routing and certificate selection. See the [HTTPS](#https) section below for more details. #### Dynamic upstreams @@ -158,7 +158,7 @@ Caddy's reverse proxy comes standard with some dynamic upstream modules. Note th Retrieves upstreams from SRV DNS records. ```caddy-d - dynamic srv [] { + dynamic srv [] { service proto name @@ -169,14 +169,14 @@ Retrieves upstreams from SRV DNS records. } ``` -- **<name>** - The full domain name of the record to look up (i.e. `_service._proto.name`). -- **service** - The service component of the full name. -- **proto** - The protocol component of the full name. Either `tcp` or `udp`. -- **name** - The name component. Or, if `service` and `proto` are empty, the full domain name to query. -- **refresh** - How often to refresh cached results. Default: `1m` -- **resolvers** - List of DNS resolvers to override system resolvers. -- **dial_timeout** - Timeout for dialing the query. -- **dial_fallback_delay** - Timeout for falling back from IPv6 to IPv4 via RFC 6555. Default: `300ms` +- **<full_name>** is the full domain name of the record to look up (i.e. `_service._proto.name`). +- **service** is the service component of the full name. +- **proto** is the protocol component of the full name. Either `tcp` or `udp`. +- **name** is the name component. Or, if `service` and `proto` are empty, the full domain name to query. +- **refresh** is how often to refresh cached results. Default: `1m` +- **resolvers** is the list of DNS resolvers to override system resolvers. +- **dial_timeout** is the timeout for dialing the query. +- **dial_fallback_delay** is how long to wait before spawning an RFC 6555 Fast Fallback connection. Default: `300ms` @@ -195,12 +195,12 @@ Retrieves upstreams from A/AAAA DNS records. } ``` -- **<name>, name** - The domain name to query. -- **<port>, port** - The port to use for the backend. -- **refresh** - How often to refresh cached results. Default: `1m` -- **resolvers** - List of DNS resolvers to override system resolvers. -- **dial_timeout** - Timeout for dialing the query. -- **dial_fallback_delay** - Timeout for falling back from IPv6 to IPv4 via RFC 6555. Default: `300ms` +- **name** is the domain name to query. +- **port** is the port to use for the backend. +- **refresh** is how often to refresh cached results. Default: `1m` +- **resolvers** is the list of DNS resolvers to override system resolvers. +- **dial_timeout** is the timeout for dialing the query. +- **dial_fallback_delay** is how long to wait before spawning an RFC 6555 Fast Fallback connection. Default: `300ms` @@ -208,18 +208,43 @@ Retrieves upstreams from A/AAAA DNS records. Load balancing is used whenever more than one upstream is defined. -- **lb_policy** is the name of the load balancing policy, along with any options. Default: `random`. Can be: - - `random` - randomly choose an upstream - - `random_choose ` - selects two or more upstreams randomly, then chooses one with least load (`n` is usually 2) - - `first` - choose first available upstream, from the order they are defined in the config - - `round_robin` - iterate each upstream in turn - - `least_conn` - choose upstream with fewest number of current requests; if more than one host has the least number of requests, then one of the hosts is chosen at random - - `ip_hash` - map the client IP to sticky upstream - - `uri_hash` - map the request URI (path and query) to sticky upstream - - `header [field]` - map request header to sticky upstream; if the specified header is not present, a random upstream is selected - - `cookie [ []]` - based on the given cookie (default name is `lb` if not specified), the cookie value is hashed, optionally with a secret for HMAC-SHA256; on the first request from a client, a random upstream is selected +- **lb_policy** is the name of the load balancing policy, along with any options. Default: `random`. + + For policies that involve hashing, the [highest-random-weight (HRW)](https://en.wikipedia.org/wiki/Rendezvous_hashing) algorithm is used to ensure that a client or request with the same hash key is mapped to the same upstream, even if the list of upstreams change. + + - `random` randomly chooses an upstream + + - `random_choose ` selects two or more upstreams randomly, then chooses one with least load (`n` is usually 2) + + - `first` chooses the first available upstream, from the order they are defined in the config + + - `round_robin` iterates each upstream in turn + + - `least_conn` choose upstream with fewest number of current requests; if more than one host has the least number of requests, then one of those hosts is chosen at random + + - `ip_hash` maps the client IP to a sticky upstream + + - `uri_hash` maps the request URI (path and query) to a sticky upstream + + - `header [field]` maps a request header to a sticky upstream, by hashing the header value; if the specified header field is not present, a random upstream is selected + + - `cookie [ []]` on the first request from a client (when there's no cookie), a random upstream is selected, and a `Set-Cookie` header is added to the response (default cookie name is `lb` if not specified). The cookie value is the upstream dial address of the chosen upstream, hashed with HMAC-SHA256 (using `` as the shared secret, empty string if not specified). + + On subsequent requests where the cookie is present, the cookie value will be mapped to the same upstream if it's available; if not available or not found, a new random upstream is selected and the cookie is added to the response. + + If you wish to use a particular upstream for debugging purposes, you may hash the upstream address with the secret, and set the cookie in your HTTP client (browser or otherwise). For example, with PHP, you could run the following to compute the cookie value, where `10.1.0.10:8080` is the address of one of your upstreams, and `secret` is your configured secret. + ```php + echo hash_hmac('sha256', '10.1.0.10:8080', 'secret'); + // cdd96966817dd14a99f47ee17451464f29998da170814a16b483e4c1ff4c48cf + ``` + + You can set the cookie in your browser via the Javascript console, for example to set the cookie named `lb`: + ```js + document.cookie = "lb=cdd96966817dd14a99f47ee17451464f29998da170814a16b483e4c1ff4c48cf"; + ``` - **lb_try_duration** is a [duration value](/docs/conventions#durations) that defines how long to try selecting available backends for each request if the next available host is down. By default, this retry is disabled. Clients will wait for up to this long while the load balancer tries to find an available upstream host. A reasonable starting point might be `5s` since the HTTP transport's default dial timeout is `3s`, so that should allow for at least one retry if the first selected upstream cannot be reached; but feel free to experiment to find the right balance for your usecase. + - **lb_try_interval** is a [duration value](/docs/conventions#durations) that defines how long to wait between selecting the next host from the pool. Default is `250ms`. Only relevant when a request to an upstream host fails. Be aware that setting this to 0 with a non-zero `lb_try_duration` can cause the CPU to spin if all backends are down and latency is very low. @@ -229,11 +254,17 @@ Load balancing is used whenever more than one upstream is defined. Active health checks perform health checking in the background on a timer: - **health_uri** is the URI path (and optional query) for active health checks. + - **health_port** is the port to use for active health checks, if different from the upstream's port. + - **health_interval** is a [duration value](/docs/conventions#durations) that defines how often to perform active health checks. + - **health_timeout** is a [duration value](/docs/conventions#durations) that defines how long to wait for a reply before marking the backend as down. + - **health_status** is the HTTP status code to expect from a healthy backend. Can be a 3-digit status code, or a status code class ending in `xx`. For example: `200` (which is the default), or `2xx`. + - **health_body** is a substring or regular expression to match on the response body of an active health check. If the backend does not return a matching body, it will be marked as down. + - **health_headers** allows specifying headers to set on the active health check requests. This is useful if you need to change the `Host` header, or if you need to provide some authentication to your backend as part of your health checks. @@ -243,10 +274,16 @@ Active health checks perform health checking in the background on a timer: Passive health checks happen inline with actual proxied requests: - **fail_duration** is a [duration value](/docs/conventions#durations) that defines how long to remember a failed request. A duration > `0` enables passive health checking; the default is `0` (off). A reasonable starting point might be `30s` to balance error rates with responsiveness when bringing an unhealthy upstream back online; but feel free to experiment to find the right balance for your usecase. + - **max_fails** is the maximum number of failed requests within `fail_duration` that are needed before considering a backend to be down; must be >= `1`; default is `1`. + - **unhealthy_status** counts a request as failed if the response comes back with one of these status codes. Can be a 3-digit status code or a status code class ending in `xx`, for example: `404` or `5xx`. + - **unhealthy_latency** is a [duration value](/docs/conventions#durations) that counts a request as failed if it takes this long to get a response. -- **unhealthy_request_count** is the permissible number of simultaneous requests to a backend before marking it as down. + +- **unhealthy_request_count** is the permissible number of simultaneous requests to a backend before marking it as down. In other words, if a particular backend is currently handling this many requests, then it's considered "overloaded" and other backends will be preferred instead. + + This should be a reasonably large number; configuring this means that the proxy will have a limit of `unhealthy_request_count × upstreams_count` total simultaneous requests, and any requests after that point will result in an error due to no upstreams being available. @@ -255,8 +292,11 @@ Passive health checks happen inline with actual proxied requests: The proxy **buffers responses** by default for wire efficiency: - **flush_interval** is a [duration value](/docs/conventions#durations) that adjusts how often Caddy should flush the response buffer to the client. By default, no periodic flushing is done. A negative value disables response buffering, and flushes immediately after each write to the client. This option is ignored when the upstream's response is recognized as a streaming response, or if its content length is `-1`; for such responses, writes are flushed to the client immediately. + - **buffer_requests** will cause the proxy to read the entire request body into a buffer before sending it upstream. This is very inefficient and should only be done if the upstream requires reading request bodies without delay (which is something the upstream application should fix). + - **buffer_responses** will cause the entire response body to be read and buffered in memory before being proxied to the client. This should be avoided if at all possible for performance reasons, but could be useful if the backend has tighter memory constraints. + - **max_buffer_size** if body buffering is enabled, this sets the maximum size of the buffers used for the requests and responses. This accepts all size formats supported by [go-humanize](https://github.com/dustin/go-humanize/blob/master/bytes.go). @@ -265,8 +305,9 @@ The proxy **buffers responses** by default for wire efficiency: The proxy can **manipulate headers** between itself and the backend: -- **header_up** Sets, adds (with the `+` prefix), removes (with the `-` prefix), or performs a replacement (by using two arguments, a search and replacement) in a request header going upstream to the backend. -- **header_down** Sets, adds (with the `+` prefix), removes (with the `-` prefix), or performs a replacement (by using two arguments, a search and replacement) in a response header coming downstream from the backend. +- **header_up** sets, adds (with the `+` prefix), deletes (with the `-` prefix), or performs a replacement (by using two arguments, a search and replacement) in a request header going upstream to the backend. + +- **header_down** sets, adds (with the `+` prefix), deletes (with the `-` prefix), or performs a replacement (by using two arguments, a search and replacement) in a response header coming downstream from the backend. For example, to set a request header, overwriting any existing values: @@ -281,12 +322,18 @@ header_down +Some-Header "first value" header_down +Some-Header "second value" ``` -To remove a request header, preventing it from reaching the backend: +To delete a request header, preventing it from reaching the backend: ```caddy-d header_up -Some-Header ``` +To delete all matching request, using a suffix match: + +```caddy-d +header_up -Some-* +``` + To perform a regular expression replacement on a request header: ```caddy-d @@ -300,11 +347,21 @@ The regular expression language used is RE2, included in Go. See the [RE2 syntax By default, Caddy passes thru incoming headers—including `Host`—to the backend without modifications, with three exceptions: -- It sets or augments the [X-Forwarded-For](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For) header field. -- It sets the [X-Forwarded-Proto](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Proto) header field. -- It sets the [X-Forwarded-Host](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Host) header field. +- It sets or augments the [`X-Forwarded-For`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For) header field. +- It sets the [`X-Forwarded-Proto`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Proto) header field. +- It sets the [`X-Forwarded-Host`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Host) header field. -For these `X-Forwarded-*` headers, by default, Caddy will ignore their values from incoming requests, to prevent spoofing. If Caddy is not the first server being connected to by your clients (for example when a CDN is in front of Caddy), you may configure `trusted_proxies` with a list of IP ranges (CIDRs) from which incoming requests are trusted to have sent good values for these headers. As a shortcut, `trusted_proxies private_ranges` may be configured to trust all private IP ranges. + For these `X-Forwarded-*` headers, by default, Caddy will ignore their values from incoming requests, to prevent spoofing. If Caddy is not the first server being connected to by your clients (for example when a CDN is in front of Caddy), you may configure `trusted_proxies` with a list of IP ranges (CIDRs) from which incoming requests are trusted to have sent good values for these headers. As a shortcut, `private_ranges` may be configured to trust all private IP ranges. + +```caddy-d +trusted_proxies private_ranges +``` + + Additionally, when using the [`http` transport](#the-http-transport), the `Accept-Encoding: gzip` header will be set, if it is missing in the request from the client. This behavior can be disabled with [`compression off`](#compression) on the transport. @@ -363,6 +420,8 @@ transport http { tls_timeout tls_trusted_ca_certs tls_server_name + tls_renegotiation + tls_except_ports keepalive [off|] keepalive_interval keepalive_idle_conns @@ -374,25 +433,56 @@ transport http { ``` - **read_buffer** is the size of the read buffer in bytes. It accepts all formats supported by [go-humanize](https://github.com/dustin/go-humanize/blob/master/bytes.go). Default: `4KiB`. + - **write_buffer** is the size of the write buffer in bytes. It accepts all formats supported by [go-humanize](https://github.com/dustin/go-humanize/blob/master/bytes.go). Default: `4KiB`. + - **max_response_header** is the maximum amount of bytes to read from response headers. It accepts all formats supported by [go-humanize](https://github.com/dustin/go-humanize/blob/master/bytes.go). Default: `10MiB`. + - **dial_timeout** is how long to wait when connecting to the upstream socket. Accepts [duration values](/docs/conventions#durations). Default: No timeout. + - **dial_fallback_delay** is how long to wait before spawning an RFC 6555 Fast Fallback connection. A negative value disables this. Accepts [duration values](/docs/conventions#durations). Default: `300ms`. + - **response_header_timeout** is how long to wait for reading response headers from the upstream. Accepts [duration values](/docs/conventions#durations). Default: No timeout. + - **expect_continue_timeout** is how long to wait for the upstreams's first response headers after fully writing the request headers if the request has the header `Expect: 100-continue`. Accepts [duration values](/docs/conventions#durations). Default: No timeout. + - **resolvers** is a list of DNS resolvers to override system resolvers. + - **tls** uses HTTPS with the backend. This will be enabled automatically if you specify backends using the `https://` scheme or port `:443`, or if any of the below `tls_*` options are configured. + - **tls_client_auth** enables TLS client authentication one of two ways: (1) by specifying a domain name for which Caddy should obtain a certificate and keep it renewed, or (2) by specifying a certificate and key file to present for TLS client authentication with the backend. + - **tls_insecure_skip_verify** turns off TLS handshake verification, making the connection insecure and vulnerable to man-in-the-middle attacks. _Do not use in production._ + - **tls_timeout** is a [duration value](/docs/conventions#durations) that specifies how long to wait for the TLS handshake to complete. Default: No timeout. + - **tls_trusted_ca_certs** is a list of PEM files that specify CA public keys to trust when connecting to the backend. -- **tls_server_name** sets the server name used when verifying the certificate received in the TLS handshake. By default, this will use the upstream address' host part. You only need to override this if your upstream address does not match the certificate the upstream is likely to use. For example if the upstream address is an IP address, then you would need to configure this to the hostname being served by the upstream server. Currently, this does not support placeholders, so a static value must be used. + +- **tls_server_name** sets the server name used when verifying the certificate received in the TLS handshake. By default, this will use the upstream address' host part. + + You only need to override this if your upstream address does not match the certificate the upstream is likely to use. For example if the upstream address is an IP address, then you would need to configure this to the hostname being served by the upstream server. + + A request placeholder may be used, in which case a clone of the HTTP transport config will be used on every request, which may incur a performance penalty. + +- **tls_renegotiation** sets the TLS renegotiation level. TLS renegotiation is the act of performing subsequent handshakes after the first. The level may be one of: + - `never` (the default) disables renegotiation. + - `once` allows a remote server to request renegotiation once per connection. + - `freely` allows a remote server to repeatedly request renegotiation. + +- **tls_except_ports** when TLS is enabled, if the upstream target uses one of the given ports, TLS will be disabled for those connections. This may be useful when configuring dynamic upstreams, where some upstreams expect HTTP and others expect HTTPS requests. + - **keepalive** is either `off` or a [duration value](/docs/conventions#durations) that specifies how long to keep connections open (timeout). Default: `2m`. + - **keepalive_interval** is a [duration value](/docs/conventions#durations) that specifies how often to probe for liveness. Default: `30s`. + - **keepalive_idle_conns** defines the maximum number of connections to keep alive. Default: No limit. + - **keepalive_idle_conns_per_host** if non-zero, controls the maximum idle (keep-alive) connections to keep per-host. Default: `32`. + - **versions** allows customizing which versions of HTTP to support. As a special case, "h2c" is a valid value which will enable cleartext HTTP/2 connections to the upstream (however, this is a non-standard feature that does not use Go's default HTTP transport, so it is exclusive of other features; subject to change or removal). Default: `1.1 2`, or if scheme is `h2c://`, `h2c 2` + - **compression** can be used to disable compression to the backend by setting it to `off`. + - **max_conns_per_host** optionally limits the total number of connections per host, including connections in the dialing, active, and idle states. Default: No limit. @@ -412,11 +502,17 @@ transport fastcgi { ``` - **root** is the root of the site. Default: `{http.vars.root}` or current working directory. + - **split** is where to split the path to get PATH_INFO at the end of the URI. + - **env** sets an extra environment variable to the given value. Can be specified more than once for multiple environment variables. + - **resolve_root_symlink** enables resolving the `root` directory to its actual value by evaluating a symbolic link, if one exists. + - **dial_timeout** is how long to wait when connecting to the upstream socket. Accepts [duration values](/docs/conventions#durations). Default: `3s`. + - **read_timeout** is how long to wait when reading from the FastCGI server. Accepts [duration values](/docs/conventions#durations). Default: no timeout. + - **write_timeout** is how long to wait when sending to the FastCGI server. Accepts [duration values](/docs/conventions#durations). Default: no timeout.