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AppConfig

fastapi_rust::prelude

Struct AppConfig 

Source 
pub struct AppConfig {
    pub name: String,
    pub version: String,
    pub debug: bool,
    pub max_body_size: usize,
    pub request_timeout_ms: u64,
    pub root_path: String,
    pub root_path_in_servers: bool,
    pub trailing_slash_mode: TrailingSlashMode,
    pub debug_config: DebugConfig,
}
Expand description

Application configuration for the FastAPI Rust framework.

Controls application-level settings including naming, debug mode, body size limits, timeouts, and routing behavior.

§Defaults

SettingDefault
name"FastAPI"
version"0.1.0"
debugfalse
max_body_size1 MB (1,048,576 bytes)
request_timeout_ms30,000 ms
root_path""
trailing_slash_modeStrict

§Example

ⓘ
use fastapi_core::AppConfig;

let config = AppConfig::default()
    .with_name("my-api")
    .with_version("2.0.0")
    .with_debug(true)
    .with_max_body_size(10 * 1024 * 1024); // 10 MB

Fields§

§name: String

Application name (used in logging and OpenAPI).

§version: String

Application version.

§debug: bool

Enable debug mode.

§max_body_size: usize

Maximum request body size in bytes.

§request_timeout_ms: u64

Default request timeout in milliseconds.

§root_path: String

Root path prefix for apps behind a reverse proxy.

When the application is served behind a reverse proxy at a sub-path, this should be set to that sub-path. For example, if the app is proxied at /api/v1, set root_path = "/api/v1".

This affects:

  • URL generation via url_for()
  • OpenAPI servers list (if root_path_in_servers is true)
§root_path_in_servers: bool

Whether to include the root_path in OpenAPI servers list.

When true and root_path is set, a server entry with the root_path will be added to the OpenAPI specification’s servers array.

§trailing_slash_mode: TrailingSlashMode

Trailing slash handling mode.

Controls how the router handles trailing slashes in URLs:

  • Strict (default): /users and /users/ are different routes
  • Redirect: 308 redirect /users/ to /users
  • RedirectWithSlash: 308 redirect /users to /users/
  • MatchBoth: accept both forms without redirect
§debug_config: DebugConfig

Debug mode configuration.

Controls whether error responses include additional diagnostic information such as source location, handler name, and route pattern. When a debug header and token are configured, debug info is only included for requests that present the correct token.

Implementations§

Source§

impl AppConfig

Source

pub fn new() -> AppConfig

Creates a new configuration with defaults.

Examples found in repository?
examples/getting_started.rs (line 95)
34fn main() {
35    println!("Getting Started Guide - Code Validation\n");
36
37    // === Basic App Example ===
38    println!("1. Basic app with two routes:");
39    let app = App::builder()
40        .get("/", hello)
41        .get("/health", health)
42        .build();
43
44    println!("   Routes: {}", app.route_count());
45    let client = TestClient::new(app);
46
47    let response = client.get("/").send();
48    println!(
49        "   GET / -> {} ({})",
50        response.status().as_u16(),
51        response.text()
52    );
53    if !check_eq(response.status().as_u16(), 200, "GET / should return 200") {
54        return;
55    }
56    if !check_eq(response.text(), "Hello, World!", "GET / should return body") {
57        return;
58    }
59
60    let response = client.get("/health").send();
61    println!(
62        "   GET /health -> {} ({})",
63        response.status().as_u16(),
64        response.text()
65    );
66    if !check_eq(
67        response.status().as_u16(),
68        200,
69        "GET /health should return 200",
70    ) {
71        return;
72    }
73
74    // === App with Middleware ===
75    println!("\n2. App with middleware:");
76    let app = App::builder()
77        .middleware(RequestIdMiddleware::new())
78        .middleware(SecurityHeaders::new())
79        .get("/", hello)
80        .build();
81
82    let client = TestClient::new(app);
83    let response = client.get("/").send();
84    println!("   GET / -> {}", response.status().as_u16());
85    if !check_eq(
86        response.status().as_u16(),
87        200,
88        "GET / with middleware should return 200",
89    ) {
90        return;
91    }
92
93    // === App with Configuration ===
94    println!("\n3. App with configuration:");
95    let config = AppConfig::new()
96        .name("My API")
97        .version("1.0.0")
98        .debug(true)
99        .max_body_size(10 * 1024 * 1024)
100        .request_timeout_ms(30_000);
101
102    let app = App::builder().config(config).get("/", hello).build();
103
104    println!("   App name: {}", app.config().name);
105    println!("   Version: {}", app.config().version);
106    if !check_eq(
107        app.config().name.as_str(),
108        "My API",
109        "Config name should match",
110    ) {
111        return;
112    }
113    if !check_eq(
114        app.config().version.as_str(),
115        "1.0.0",
116        "Config version should match",
117    ) {
118        return;
119    }
120
121    // === 404 for unknown routes ===
122    println!("\n4. 404 for unknown routes:");
123    let app = App::builder().get("/", hello).build();
124
125    let client = TestClient::new(app);
126    let response = client.get("/nonexistent").send();
127    println!("   GET /nonexistent -> {}", response.status().as_u16());
128    if !check_eq(
129        response.status().as_u16(),
130        404,
131        "Unknown routes should return 404",
132    ) {
133        return;
134    }
135
136    println!("\nAll getting started examples validated successfully!");
137}
Source

pub fn name(self, name: impl Into<String>) -> AppConfig

Sets the application name.

Examples found in repository?
examples/getting_started.rs (line 96)
34fn main() {
35    println!("Getting Started Guide - Code Validation\n");
36
37    // === Basic App Example ===
38    println!("1. Basic app with two routes:");
39    let app = App::builder()
40        .get("/", hello)
41        .get("/health", health)
42        .build();
43
44    println!("   Routes: {}", app.route_count());
45    let client = TestClient::new(app);
46
47    let response = client.get("/").send();
48    println!(
49        "   GET / -> {} ({})",
50        response.status().as_u16(),
51        response.text()
52    );
53    if !check_eq(response.status().as_u16(), 200, "GET / should return 200") {
54        return;
55    }
56    if !check_eq(response.text(), "Hello, World!", "GET / should return body") {
57        return;
58    }
59
60    let response = client.get("/health").send();
61    println!(
62        "   GET /health -> {} ({})",
63        response.status().as_u16(),
64        response.text()
65    );
66    if !check_eq(
67        response.status().as_u16(),
68        200,
69        "GET /health should return 200",
70    ) {
71        return;
72    }
73
74    // === App with Middleware ===
75    println!("\n2. App with middleware:");
76    let app = App::builder()
77        .middleware(RequestIdMiddleware::new())
78        .middleware(SecurityHeaders::new())
79        .get("/", hello)
80        .build();
81
82    let client = TestClient::new(app);
83    let response = client.get("/").send();
84    println!("   GET / -> {}", response.status().as_u16());
85    if !check_eq(
86        response.status().as_u16(),
87        200,
88        "GET / with middleware should return 200",
89    ) {
90        return;
91    }
92
93    // === App with Configuration ===
94    println!("\n3. App with configuration:");
95    let config = AppConfig::new()
96        .name("My API")
97        .version("1.0.0")
98        .debug(true)
99        .max_body_size(10 * 1024 * 1024)
100        .request_timeout_ms(30_000);
101
102    let app = App::builder().config(config).get("/", hello).build();
103
104    println!("   App name: {}", app.config().name);
105    println!("   Version: {}", app.config().version);
106    if !check_eq(
107        app.config().name.as_str(),
108        "My API",
109        "Config name should match",
110    ) {
111        return;
112    }
113    if !check_eq(
114        app.config().version.as_str(),
115        "1.0.0",
116        "Config version should match",
117    ) {
118        return;
119    }
120
121    // === 404 for unknown routes ===
122    println!("\n4. 404 for unknown routes:");
123    let app = App::builder().get("/", hello).build();
124
125    let client = TestClient::new(app);
126    let response = client.get("/nonexistent").send();
127    println!("   GET /nonexistent -> {}", response.status().as_u16());
128    if !check_eq(
129        response.status().as_u16(),
130        404,
131        "Unknown routes should return 404",
132    ) {
133        return;
134    }
135
136    println!("\nAll getting started examples validated successfully!");
137}
Source

pub fn version(self, version: impl Into<String>) -> AppConfig

Sets the application version.

Examples found in repository?
examples/getting_started.rs (line 97)
34fn main() {
35    println!("Getting Started Guide - Code Validation\n");
36
37    // === Basic App Example ===
38    println!("1. Basic app with two routes:");
39    let app = App::builder()
40        .get("/", hello)
41        .get("/health", health)
42        .build();
43
44    println!("   Routes: {}", app.route_count());
45    let client = TestClient::new(app);
46
47    let response = client.get("/").send();
48    println!(
49        "   GET / -> {} ({})",
50        response.status().as_u16(),
51        response.text()
52    );
53    if !check_eq(response.status().as_u16(), 200, "GET / should return 200") {
54        return;
55    }
56    if !check_eq(response.text(), "Hello, World!", "GET / should return body") {
57        return;
58    }
59
60    let response = client.get("/health").send();
61    println!(
62        "   GET /health -> {} ({})",
63        response.status().as_u16(),
64        response.text()
65    );
66    if !check_eq(
67        response.status().as_u16(),
68        200,
69        "GET /health should return 200",
70    ) {
71        return;
72    }
73
74    // === App with Middleware ===
75    println!("\n2. App with middleware:");
76    let app = App::builder()
77        .middleware(RequestIdMiddleware::new())
78        .middleware(SecurityHeaders::new())
79        .get("/", hello)
80        .build();
81
82    let client = TestClient::new(app);
83    let response = client.get("/").send();
84    println!("   GET / -> {}", response.status().as_u16());
85    if !check_eq(
86        response.status().as_u16(),
87        200,
88        "GET / with middleware should return 200",
89    ) {
90        return;
91    }
92
93    // === App with Configuration ===
94    println!("\n3. App with configuration:");
95    let config = AppConfig::new()
96        .name("My API")
97        .version("1.0.0")
98        .debug(true)
99        .max_body_size(10 * 1024 * 1024)
100        .request_timeout_ms(30_000);
101
102    let app = App::builder().config(config).get("/", hello).build();
103
104    println!("   App name: {}", app.config().name);
105    println!("   Version: {}", app.config().version);
106    if !check_eq(
107        app.config().name.as_str(),
108        "My API",
109        "Config name should match",
110    ) {
111        return;
112    }
113    if !check_eq(
114        app.config().version.as_str(),
115        "1.0.0",
116        "Config version should match",
117    ) {
118        return;
119    }
120
121    // === 404 for unknown routes ===
122    println!("\n4. 404 for unknown routes:");
123    let app = App::builder().get("/", hello).build();
124
125    let client = TestClient::new(app);
126    let response = client.get("/nonexistent").send();
127    println!("   GET /nonexistent -> {}", response.status().as_u16());
128    if !check_eq(
129        response.status().as_u16(),
130        404,
131        "Unknown routes should return 404",
132    ) {
133        return;
134    }
135
136    println!("\nAll getting started examples validated successfully!");
137}
Source

pub fn debug(self, debug: bool) -> AppConfig

Enables or disables debug mode.

Examples found in repository?
examples/getting_started.rs (line 98)
34fn main() {
35    println!("Getting Started Guide - Code Validation\n");
36
37    // === Basic App Example ===
38    println!("1. Basic app with two routes:");
39    let app = App::builder()
40        .get("/", hello)
41        .get("/health", health)
42        .build();
43
44    println!("   Routes: {}", app.route_count());
45    let client = TestClient::new(app);
46
47    let response = client.get("/").send();
48    println!(
49        "   GET / -> {} ({})",
50        response.status().as_u16(),
51        response.text()
52    );
53    if !check_eq(response.status().as_u16(), 200, "GET / should return 200") {
54        return;
55    }
56    if !check_eq(response.text(), "Hello, World!", "GET / should return body") {
57        return;
58    }
59
60    let response = client.get("/health").send();
61    println!(
62        "   GET /health -> {} ({})",
63        response.status().as_u16(),
64        response.text()
65    );
66    if !check_eq(
67        response.status().as_u16(),
68        200,
69        "GET /health should return 200",
70    ) {
71        return;
72    }
73
74    // === App with Middleware ===
75    println!("\n2. App with middleware:");
76    let app = App::builder()
77        .middleware(RequestIdMiddleware::new())
78        .middleware(SecurityHeaders::new())
79        .get("/", hello)
80        .build();
81
82    let client = TestClient::new(app);
83    let response = client.get("/").send();
84    println!("   GET / -> {}", response.status().as_u16());
85    if !check_eq(
86        response.status().as_u16(),
87        200,
88        "GET / with middleware should return 200",
89    ) {
90        return;
91    }
92
93    // === App with Configuration ===
94    println!("\n3. App with configuration:");
95    let config = AppConfig::new()
96        .name("My API")
97        .version("1.0.0")
98        .debug(true)
99        .max_body_size(10 * 1024 * 1024)
100        .request_timeout_ms(30_000);
101
102    let app = App::builder().config(config).get("/", hello).build();
103
104    println!("   App name: {}", app.config().name);
105    println!("   Version: {}", app.config().version);
106    if !check_eq(
107        app.config().name.as_str(),
108        "My API",
109        "Config name should match",
110    ) {
111        return;
112    }
113    if !check_eq(
114        app.config().version.as_str(),
115        "1.0.0",
116        "Config version should match",
117    ) {
118        return;
119    }
120
121    // === 404 for unknown routes ===
122    println!("\n4. 404 for unknown routes:");
123    let app = App::builder().get("/", hello).build();
124
125    let client = TestClient::new(app);
126    let response = client.get("/nonexistent").send();
127    println!("   GET /nonexistent -> {}", response.status().as_u16());
128    if !check_eq(
129        response.status().as_u16(),
130        404,
131        "Unknown routes should return 404",
132    ) {
133        return;
134    }
135
136    println!("\nAll getting started examples validated successfully!");
137}
Source

pub fn max_body_size(self, size: usize) -> AppConfig

Sets the maximum request body size.

Examples found in repository?
examples/getting_started.rs (line 99)
34fn main() {
35    println!("Getting Started Guide - Code Validation\n");
36
37    // === Basic App Example ===
38    println!("1. Basic app with two routes:");
39    let app = App::builder()
40        .get("/", hello)
41        .get("/health", health)
42        .build();
43
44    println!("   Routes: {}", app.route_count());
45    let client = TestClient::new(app);
46
47    let response = client.get("/").send();
48    println!(
49        "   GET / -> {} ({})",
50        response.status().as_u16(),
51        response.text()
52    );
53    if !check_eq(response.status().as_u16(), 200, "GET / should return 200") {
54        return;
55    }
56    if !check_eq(response.text(), "Hello, World!", "GET / should return body") {
57        return;
58    }
59
60    let response = client.get("/health").send();
61    println!(
62        "   GET /health -> {} ({})",
63        response.status().as_u16(),
64        response.text()
65    );
66    if !check_eq(
67        response.status().as_u16(),
68        200,
69        "GET /health should return 200",
70    ) {
71        return;
72    }
73
74    // === App with Middleware ===
75    println!("\n2. App with middleware:");
76    let app = App::builder()
77        .middleware(RequestIdMiddleware::new())
78        .middleware(SecurityHeaders::new())
79        .get("/", hello)
80        .build();
81
82    let client = TestClient::new(app);
83    let response = client.get("/").send();
84    println!("   GET / -> {}", response.status().as_u16());
85    if !check_eq(
86        response.status().as_u16(),
87        200,
88        "GET / with middleware should return 200",
89    ) {
90        return;
91    }
92
93    // === App with Configuration ===
94    println!("\n3. App with configuration:");
95    let config = AppConfig::new()
96        .name("My API")
97        .version("1.0.0")
98        .debug(true)
99        .max_body_size(10 * 1024 * 1024)
100        .request_timeout_ms(30_000);
101
102    let app = App::builder().config(config).get("/", hello).build();
103
104    println!("   App name: {}", app.config().name);
105    println!("   Version: {}", app.config().version);
106    if !check_eq(
107        app.config().name.as_str(),
108        "My API",
109        "Config name should match",
110    ) {
111        return;
112    }
113    if !check_eq(
114        app.config().version.as_str(),
115        "1.0.0",
116        "Config version should match",
117    ) {
118        return;
119    }
120
121    // === 404 for unknown routes ===
122    println!("\n4. 404 for unknown routes:");
123    let app = App::builder().get("/", hello).build();
124
125    let client = TestClient::new(app);
126    let response = client.get("/nonexistent").send();
127    println!("   GET /nonexistent -> {}", response.status().as_u16());
128    if !check_eq(
129        response.status().as_u16(),
130        404,
131        "Unknown routes should return 404",
132    ) {
133        return;
134    }
135
136    println!("\nAll getting started examples validated successfully!");
137}
Source

pub fn request_timeout_ms(self, timeout: u64) -> AppConfig

Sets the default request timeout in milliseconds.

Examples found in repository?
examples/getting_started.rs (line 100)
34fn main() {
35    println!("Getting Started Guide - Code Validation\n");
36
37    // === Basic App Example ===
38    println!("1. Basic app with two routes:");
39    let app = App::builder()
40        .get("/", hello)
41        .get("/health", health)
42        .build();
43
44    println!("   Routes: {}", app.route_count());
45    let client = TestClient::new(app);
46
47    let response = client.get("/").send();
48    println!(
49        "   GET / -> {} ({})",
50        response.status().as_u16(),
51        response.text()
52    );
53    if !check_eq(response.status().as_u16(), 200, "GET / should return 200") {
54        return;
55    }
56    if !check_eq(response.text(), "Hello, World!", "GET / should return body") {
57        return;
58    }
59
60    let response = client.get("/health").send();
61    println!(
62        "   GET /health -> {} ({})",
63        response.status().as_u16(),
64        response.text()
65    );
66    if !check_eq(
67        response.status().as_u16(),
68        200,
69        "GET /health should return 200",
70    ) {
71        return;
72    }
73
74    // === App with Middleware ===
75    println!("\n2. App with middleware:");
76    let app = App::builder()
77        .middleware(RequestIdMiddleware::new())
78        .middleware(SecurityHeaders::new())
79        .get("/", hello)
80        .build();
81
82    let client = TestClient::new(app);
83    let response = client.get("/").send();
84    println!("   GET / -> {}", response.status().as_u16());
85    if !check_eq(
86        response.status().as_u16(),
87        200,
88        "GET / with middleware should return 200",
89    ) {
90        return;
91    }
92
93    // === App with Configuration ===
94    println!("\n3. App with configuration:");
95    let config = AppConfig::new()
96        .name("My API")
97        .version("1.0.0")
98        .debug(true)
99        .max_body_size(10 * 1024 * 1024)
100        .request_timeout_ms(30_000);
101
102    let app = App::builder().config(config).get("/", hello).build();
103
104    println!("   App name: {}", app.config().name);
105    println!("   Version: {}", app.config().version);
106    if !check_eq(
107        app.config().name.as_str(),
108        "My API",
109        "Config name should match",
110    ) {
111        return;
112    }
113    if !check_eq(
114        app.config().version.as_str(),
115        "1.0.0",
116        "Config version should match",
117    ) {
118        return;
119    }
120
121    // === 404 for unknown routes ===
122    println!("\n4. 404 for unknown routes:");
123    let app = App::builder().get("/", hello).build();
124
125    let client = TestClient::new(app);
126    let response = client.get("/nonexistent").send();
127    println!("   GET /nonexistent -> {}", response.status().as_u16());
128    if !check_eq(
129        response.status().as_u16(),
130        404,
131        "Unknown routes should return 404",
132    ) {
133        return;
134    }
135
136    println!("\nAll getting started examples validated successfully!");
137}
Source

pub fn root_path(self, path: impl Into<String>) -> AppConfig

Sets the root path for apps behind a reverse proxy.

When the application is served behind a reverse proxy at a sub-path, set this to that sub-path. For example, if the app is proxied at /api/v1, set root_path("/api/v1").

§Example
ⓘ
let config = AppConfig::new().root_path("/api/v1");
Source

pub fn root_path_in_servers(self, include: bool) -> AppConfig

Sets whether to include root_path in OpenAPI servers list.

When true and root_path is set, a server entry with the root_path will be added to the OpenAPI specification’s servers array.

Source

pub fn trailing_slash_mode(self, mode: TrailingSlashMode) -> AppConfig

Sets the trailing slash handling mode.

Controls how the router handles trailing slashes in URLs.

§Example
ⓘ
use fastapi_core::TrailingSlashMode;

let config = AppConfig::new()
    .trailing_slash_mode(TrailingSlashMode::Redirect);
Source

pub fn debug_config(self, config: DebugConfig) -> AppConfig

Sets the debug mode configuration.

Controls whether error responses include additional diagnostic information. Use with DebugConfig::new().enable().with_debug_header(...).

§Example
ⓘ
use fastapi_core::{DebugConfig};

let config = AppConfig::new()
    .debug_config(DebugConfig::new()
        .enable()
        .with_debug_header("X-Debug-Token", "my-secret"));
Source

pub fn from_env() -> Result<AppConfig, ConfigError>

Load configuration from environment variables.

Variables (prefix FASTAPI_ by default):

  • FASTAPI_NAME
  • FASTAPI_VERSION
  • FASTAPI_DEBUG (true/false/1/0/yes/no/on/off)
  • FASTAPI_MAX_BODY_SIZE (bytes)
  • FASTAPI_REQUEST_TIMEOUT_MS
  • FASTAPI_ROOT_PATH (path prefix for reverse proxy)
  • FASTAPI_ROOT_PATH_IN_SERVERS (true/false/1/0/yes/no/on/off)
Source

pub fn from_env_with_prefix(prefix: &str) -> Result<AppConfig, ConfigError>

Load configuration from environment variables using a custom prefix.

Source

pub fn from_file(path: impl AsRef<Path>) -> Result<AppConfig, ConfigError>

Load configuration from a JSON file.

Only JSON is supported for now to keep dependencies minimal.

Source

pub fn from_env_and_file( path: impl AsRef<Path>, ) -> Result<AppConfig, ConfigError>

Load configuration from a JSON file then override with environment variables.

Source

pub fn openapi_server(&self) -> Option<(String, Option<String>)>

Returns the root_path as an OpenAPI server entry if configured.

Returns Some((url, description)) if:

  • root_path is non-empty
  • root_path_in_servers is true

Returns None otherwise.

§Example
ⓘ
let config = AppConfig::new().root_path("/api/v1");
if let Some((url, description)) = config.openapi_server() {
    builder = builder.server(url, description);
}
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pub fn validate(&self) -> Result<(), ConfigError>

Validate configuration values.

Trait Implementations§

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impl Clone for AppConfig

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fn clone(&self) -> AppConfig

Returns a duplicate of the value. Read more
1.0.0 · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for AppConfig

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl Default for AppConfig

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fn default() -> AppConfig

Returns the “default value” for a type. Read more

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impl<T> Any for T
where T: 'static + ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Same for T

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type Output = T

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type Owned = T

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Uses borrowed data to replace owned data, usually by cloning. Read more
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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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