233 lines
7.2 KiB
Rust
233 lines
7.2 KiB
Rust
//! Async-graphql integration with Rocket.
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//!
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//! Note: This integrates with the unreleased version 0.5 of Rocket, and so
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//! breaking changes in both this library and Rocket are to be expected.
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//!
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//! To configure options for sending and receiving multipart requests, add your
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//! instance of `MultipartOptions` to the state managed by Rocket
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//! (`.manage(your_multipart_options)`).
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//!
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//! **[Full Example](<https://github.com/async-graphql/examples/blob/master/rocket/starwars/src/main.rs>)**
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#![warn(missing_docs)]
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#![forbid(unsafe_code)]
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use core::any::Any;
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use std::io::Cursor;
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use async_graphql::{
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http::MultipartOptions, ObjectType, ParseRequestError, Schema, SubscriptionType,
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};
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use rocket::{
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data::{self, Data, FromData, ToByteUnit},
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form::FromForm,
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http::{ContentType, Header, Status},
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response::{self, Responder},
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};
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use tokio_util::compat::TokioAsyncReadCompatExt;
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/// A batch request which can be extracted from a request's body.
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///
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/// # Examples
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///
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/// ```ignore
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/// #[rocket::post("/graphql", data = "<request>", format = "application/json", rank = 1)]
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/// async fn graphql_request(schema: State<'_, ExampleSchema>, request: BatchRequest) -> Response {
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/// request.execute(&schema).await
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/// }
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/// ```
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#[derive(Debug)]
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pub struct GraphQLBatchRequest(pub async_graphql::BatchRequest);
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impl GraphQLBatchRequest {
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/// Shortcut method to execute the request on the schema.
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pub async fn execute<Query, Mutation, Subscription>(
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self,
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schema: &Schema<Query, Mutation, Subscription>,
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) -> GraphQLResponse
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where
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Query: ObjectType + 'static,
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Mutation: ObjectType + 'static,
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Subscription: SubscriptionType + 'static,
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{
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GraphQLResponse(schema.execute_batch(self.0).await)
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}
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}
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#[rocket::async_trait]
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impl<'r> FromData<'r> for GraphQLBatchRequest {
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type Error = ParseRequestError;
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async fn from_data(req: &'r rocket::Request<'_>, data: Data<'r>) -> data::Outcome<'r, Self> {
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let opts: MultipartOptions = req.rocket().state().copied().unwrap_or_default();
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let request = async_graphql::http::receive_batch_body(
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req.headers().get_one("Content-Type"),
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data.open(
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req.limits()
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.get("graphql")
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.unwrap_or_else(|| 128.kibibytes()),
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)
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.compat(),
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opts,
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)
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.await;
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match request {
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Ok(request) => data::Outcome::Success(Self(request)),
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Err(e) => data::Outcome::Failure((
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match e {
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ParseRequestError::PayloadTooLarge => Status::PayloadTooLarge,
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_ => Status::BadRequest,
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},
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e,
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)),
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}
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}
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}
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/// A GraphQL request which can be extracted from the request's body.
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///
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/// # Examples
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///
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/// ```ignore
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/// #[rocket::post("/graphql", data = "<request>", format = "application/json", rank = 2)]
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/// async fn graphql_request(schema: State<'_, ExampleSchema>, request: Request) -> Result<Response, Status> {
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/// request.execute(&schema).await
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/// }
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/// ```
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#[derive(Debug)]
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pub struct GraphQLRequest(pub async_graphql::Request);
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impl GraphQLRequest {
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/// Shortcut method to execute the request on the schema.
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pub async fn execute<Query, Mutation, Subscription>(
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self,
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schema: &Schema<Query, Mutation, Subscription>,
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) -> GraphQLResponse
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where
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Query: ObjectType + 'static,
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Mutation: ObjectType + 'static,
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Subscription: SubscriptionType + 'static,
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{
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GraphQLResponse(schema.execute(self.0).await.into())
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}
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/// Insert some data for this request.
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#[must_use]
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pub fn data<D: Any + Send + Sync>(mut self, data: D) -> Self {
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self.0.data.insert(data);
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self
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}
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}
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impl From<GraphQLQuery> for GraphQLRequest {
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fn from(query: GraphQLQuery) -> Self {
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let mut request = async_graphql::Request::new(query.query);
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if let Some(operation_name) = query.operation_name {
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request = request.operation_name(operation_name);
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}
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if let Some(variables) = query.variables {
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let value = serde_json::from_str(&variables).unwrap_or_default();
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let variables = async_graphql::Variables::from_json(value);
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request = request.variables(variables);
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}
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GraphQLRequest(request)
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}
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}
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/// A GraphQL request which can be extracted from a query string.
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///
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/// # Examples
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///
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/// ```ignore
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/// #[rocket::get("/graphql?<query..>")]
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/// async fn graphql_query(schema: State<'_, ExampleSchema>, query: Query) -> Result<Response, Status> {
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/// query.execute(&schema).await
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/// }
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/// ```
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#[derive(FromForm, Debug)]
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pub struct GraphQLQuery {
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query: String,
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#[field(name = "operationName")]
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operation_name: Option<String>,
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variables: Option<String>,
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}
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impl GraphQLQuery {
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/// Shortcut method to execute the request on the schema.
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pub async fn execute<Query, Mutation, Subscription>(
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self,
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schema: &Schema<Query, Mutation, Subscription>,
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) -> GraphQLResponse
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where
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Query: ObjectType + 'static,
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Mutation: ObjectType + 'static,
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Subscription: SubscriptionType + 'static,
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{
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let request: GraphQLRequest = self.into();
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request.execute(schema).await
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}
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}
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#[rocket::async_trait]
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impl<'r> FromData<'r> for GraphQLRequest {
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type Error = ParseRequestError;
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async fn from_data(req: &'r rocket::Request<'_>, data: Data<'r>) -> data::Outcome<'r, Self> {
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GraphQLBatchRequest::from_data(req, data)
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.await
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.and_then(|request| match request.0.into_single() {
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Ok(single) => data::Outcome::Success(Self(single)),
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Err(e) => data::Outcome::Failure((Status::BadRequest, e)),
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})
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}
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}
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/// Wrapper around `async-graphql::Response` that is a Rocket responder so it
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/// can be returned from a routing function in Rocket.
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///
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/// It contains a `BatchResponse` but since a response is a type of batch
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/// response it works for both.
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#[derive(Debug)]
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pub struct GraphQLResponse(pub async_graphql::BatchResponse);
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impl From<async_graphql::BatchResponse> for GraphQLResponse {
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fn from(batch: async_graphql::BatchResponse) -> Self {
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Self(batch)
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}
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}
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impl From<async_graphql::Response> for GraphQLResponse {
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fn from(res: async_graphql::Response) -> Self {
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Self(res.into())
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}
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}
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impl<'r> Responder<'r, 'static> for GraphQLResponse {
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fn respond_to(self, _: &'r rocket::Request<'_>) -> response::Result<'static> {
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let body = serde_json::to_string(&self.0).unwrap();
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let mut response = rocket::Response::new();
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response.set_header(ContentType::new("application", "json"));
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if self.0.is_ok() {
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if let Some(cache_control) = self.0.cache_control().value() {
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response.set_header(Header::new("cache-control", cache_control));
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}
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}
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for (name, value) in self.0.http_headers_iter() {
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if let Ok(value) = value.to_str() {
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response.adjoin_header(Header::new(name.as_str().to_string(), value.to_string()));
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}
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}
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response.set_sized_body(body.len(), Cursor::new(body));
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Ok(response)
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}
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}
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