Struct QueryError 

pub struct QueryError { /* private fields */ }

A query-string decode failure, carrying the field path it occurred at.

Rendered as filter.limit: invalid digit found in string so a caller sees which parameter failed, not just that something did.

Trait Implementations

impl Clone for QueryError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QueryError

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

Formats the value using the given formatter.

impl Display for QueryError

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

Formats the value using the given formatter.

impl Eq for QueryError

impl Error for QueryError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl Error for QueryError

fn custom<T: Display>(_msg: T) -> Self

The catch-all serde uses for a #[serde(deserialize_with)] helper’s own message — discarded, not bounded.

A helper is free to write E::custom(format!("invalid token {value}")), and this module cannot audit what it interpolates. Truncating and control-stripping such a message still surfaces the leading 160 characters of it into the 400 body and every error reporter, which does not satisfy the module’s guarantee that an error never echoes a submitted value — a query parameter can hold a secret. So the content is dropped entirely and replaced with a fixed message; the field path is attached separately and is derived from the target type, not the request. A handler wanting a specific user-facing message should validate after extraction, where it controls what the response says.

fn invalid_type(unexp: Unexpected<'_>, exp: &dyn Expected) -> Self

invalid type: string "SUPERSECRET", expected u32 — serde’s default renders the value. Report the shape only.

fn invalid_value(unexp: Unexpected<'_>, exp: &dyn Expected) -> Self

Same reasoning as invalid_type above: the value is the secret-bearing half of the message.

fn unknown_variant(variant: &str, expected: &'static [&'static str]) -> Self

serde renders the rejected variant name, which is request text. The expected list is compile-time and safe to keep.

fn unknown_field(field: &str, expected: &'static [&'static str]) -> Self

#[serde(deny_unknown_fields)] feeds the submitted key here, which is both attacker-chosen and unbounded.

fn invalid_length(len: usize, exp: &dyn Expected) -> Self

Raised when deserializing a sequence or map and the input data contains too many or too few elements.

fn missing_field(field: &'static str) -> Self

Raised when a Deserialize struct type expected to receive a required field with a particular name but that field was not present in the input.

fn duplicate_field(field: &'static str) -> Self

Raised when a Deserialize struct type received more than one of the same field.

impl PartialEq for QueryError

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for QueryError