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seanmonstar / reqwest

An easy and powerful Rust HTTP Client
https://docs.rs/reqwest
Apache License 2.0
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Error when parsing large JSON with `.json::<serde_json::Value>()` in wasm and Node.js 22 #2338

Closed Thoralf-M closed 2 months ago

Thoralf-M commented 4 months ago

With a large JSON (maybe only single large strings inside needed?) .json::<serde_json::Value>() will fail with decoding response body: expected value at line 1 column 1 with WASM in node.js v22. For other JSON responses it works perfectly fine. The response .bytes() start with the following (probably relevant here, contains 431 Request Header Fields Too Large and 413 Payload Too Large), and afterwards the actual response. 

/\0\0\0\0\0\0\0\r\n\0\0\0\0\0\0HTTP/1.1 400 Bad Request\r\nConnection: close\r\n\r\n\0HTTP/1.1 408 Request Timeout\r\nConnection: close\r\n\r\n\0\0\0\0\0HTTP/1.1 431 Request Header Fields Too Large\r\nConnection: close\r\n\r\n\0\0\0\0\0HTTP/1.1 413 Payload Too Large\r\nConnection: close\r\n\r\n\0\0\0form-data; name=\"\0\0\0\0\0\0\0; filename\0\0\0\0\0\0--\0\0\0\0\0\0--\r\n\0\0\0\0\0\0\xff\xff\0\0\0\0\x08http/1.1\0\0\0\0\0\0\0\x08http/1.1\0\0\0\0\0\0\0\x08http/1.1\0\0\0\0\0\0\0

Calling .text() on the response works fine.

Full output from index.js

works: [{"body":"laudantium enim quasi est quidem magnam voluptate ipsam eos\ntempora quo necessitatibus\ndolor quam autem quasi\nreiciendis et nam sapiente accusantium","email":"Eliseo@gardner.biz","id":1,"name":"id labore ex et quam laborum","postId":1},{"body":"est natus enim nihil est dolore omnis voluptatem numquam\net omnis occaecati quod ullam at\nvoluptatem error expedita pariatur\nnihil sint nostrum voluptatem reiciendis et","email":"Jayne_Kuhic@sydney.com","id":2,"name":"quo vero reiciendis velit similique earum","postId":1},{"body":"quia molestiae reprehenderit quasi aspernatur\naut expedita occaecati aliquam eveniet laudantium\nomnis quibusdam delectus saepe quia accusamus maiores nam est\ncum et ducimus et vero voluptates excepturi deleniti ratione","email":"Nikita@garfield.biz","id":3,"name":"odio adipisci rerum aut animi","postId":1},{"body":"non et atque\noccaecati deserunt quas accusantium unde odit nobis qui voluptatem\nquia voluptas consequuntur itaque dolor\net qui rerum deleniti ut occaecati","email":"Lew@alysha.tv","id":4,"name":"alias odio sit","postId":1},{"body":"harum non quasi et ratione\ntempore iure ex voluptates in ratione\nharum architecto fugit inventore cupiditate\nvoluptates magni quo et","email":"Hayden@althea.biz","id":5,"name":"vero eaque aliquid doloribus et culpa","postId":1}]
bytes: b"/\0\0\0\0\0\0\0\r\n\0\0\0\0\0\0HTTP/1.1 400 Bad Request\r\nConnection: close\r\n\r\n\0HTTP/1.1 408 Request Timeout\r\nConnection: close\r\n\r\n\0\0\0\0\0HTTP/1.1 431 Request Header Fields Too Large\r\nConnection: close\r\n\r\n\0\0\0\0\0HTTP/1.1 413 Payload Too Large\r\nConnection: close\r\n\r\n\0\0\0form-data; name=\"\0\0\0\0\0\0\0; filename\0\0\0\0\0\0--\0\0\0\0\0\0--\r\n\0\0\0\0\0\0\xff\xff\0\0\0\0\x08http/1.1\0\0\0\0\0\0\0\x08http/1.1\0\0\0\0\0\0\0\x08http/1.1\0\0\0\0\0\0\0[\n  {\n    \"postId\": 1,\n    \"id\": 1,\n    \"name\": \"id labore ex et quam laborum\",\n    \"email\": \"Eliseo@gardner.biz\",\n    \"body\": \"laudantium enim quasi est quidem magnam voluptate ipsam eos\\ntempora quo necessitatibus\\ndolor quam autem quasi\\nreiciendis et nam sapiente accusantium\"\n  },\n  {\n    \"postId\": 1,\n    \"id\": 2,\n    \"name\": \"quo vero reiciendis velit similique earum\",\n    \"email\": \"Jayne_Kuhic@sydney.com\",\n    \"body\": \"est natus enim nihil est dolore omnis voluptatem numquam\\net omnis occaecati quod ullam at\\nvoluptatem error expedita pariatur\\nnihil sint nostrum voluptatem reiciendis et\"\n  },\n  {\n    \"postId\": 1,\n    \"id\": 3,\n    \"name\": \"odio adipisci rerum aut animi\",\n    \"email\": \"Nikita@garfield.biz\",\n    \"body\": \"quia molestiae reprehenderit quasi aspernatur\\naut expedita occaecati aliquam eveniet laudantium\\nomnis quibusdam delectus saepe quia accusamus maiores nam est\\ncum et ducimus et vero voluptates excepturi deleniti ratione\"\n  },\n  {\n    \"postId\": 1,\n    \"id\": 4,\n    \"name\": \"alias odio sit\",\n    \"email\": \"Lew@alysha.tv\",\n    \"body\": \"non et atque\\noccaecati deserunt quas accusantium unde odit nobis qui voluptatem\\nquia voluptas consequuntur itaque dolor\\net qui rerum deleniti ut occaecati\"\n  },\n  {\n    \"postId\": 1,\n    \"id\": 5,\n    \"name\": \"vero eaque aliquid doloribus et culpa\",\n    \"email\": \"Hayden@althea.biz\",\n    \"body\": \"harum non quasi et ratione\\ntempore iure ex voluptates in ratione\\nharum architecto fugit inventore cupiditate\\nvoluptates magni quo et\"\n  }\n]\0\0[\n  {\n    \"postId\": 1,\n    \"id\": 1,\n    \"name\": \"id labore ex et quam laborum\",\n    \"email\": \"Eliseo@gardner.biz\",\n    \"body\": \"laudantium enim quasi est quidem magnam voluptate ipsam eos\\ntempora quo necessitatibus\\ndolor quam autem quasi\\nreiciendis et nam sapiente accusantium\"\n  },\n  {\n    \"postId\": 1,\n    \"id\": 2,\n    \"name\": \"quo vero reiciendis velit similique earum\",\n    \"email\": \"Jayne_Kuhic@sydney.com\",\n    \"body\": \"est natus enim nihil est dolore omnis voluptatem numquam\\net omnis occaecati quod ullam at\\nvoluptatem error expedita pariatur\\nnihil sint nostrum voluptatem reiciendis et\"\n  },\n  {\n    \"postId\": 1,\n    \"id\": 3,\n    \"name\": \"odio adipisci rerum aut animi\",\n    \"email\": \"Nikita@garfield.biz\",\n    \"body\": \"quia molestiae reprehenderit quasi aspernatur\\naut expedita occaecati aliquam eveniet laudantium\\nomnis quibusdam delectus saepe quia accusamus maiores nam est\\ncum et ducimus et vero voluptates excepturi deleniti ratione\"\n  },\n  {\n    \"postId\": 1,\n    \"id\": 4,\n    \"name\": \"alias odio sit\",\n    \"email\": \"Lew@alysha.tv\",\n    \"body\": \"non et atque\\noccaecati deserunt quas accusantium unde odit nobis qui voluptatem\\nquia voluptas consequuntur itaque dolor\\net qui rerum deleniti ut occaecati\"\n  },\n  {\n    \"postId\": 1,\n    \"id\": 5,\n    \"name\": \"vero eaque aliquid doloribus et culpa\",\n    \"email\": \"Hayden@althea.biz\",\n    \"body\": \"harum non quasi et ratione\\ntempore iure ex voluptates in ratione\\nharum architecto fugit inventore cupiditate\\nvoluptates magni quo et\"\n  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error decoding response body: expected value at line 1 column 1

To reproduce

Run docker run --rm $(docker build -q .) with these files:

Dockerfile

FROM node:22
WORKDIR /usr/src/app
COPY ./ ./
# Install Rust
RUN curl https://sh.rustup.rs -sSf | sh -s -- -y 

# Build and run the example
CMD export PATH="$HOME/.cargo/bin:$PATH" && \
    npm install -g wasm-pack && \
    wasm-pack build --target nodejs && \
    node index.js

Cargo.toml

[workspace]
[package]
name = "reqwest-wasm"
version = "0.1.0"
edition = "2021"

[lib]
crate-type = ["cdylib", "rlib"]

[dependencies]
js-sys = { version = "0.3.68", default-features = false, features = [] }
serde_json = { version = "1.0.113", default-features = false }
reqwest = { version = "0.11.24", default-features = false, features = [
    "json",
]}
wasm-bindgen = { version = "0.2.92", default-features = false, features = [
    "std",
    "serde-serialize",
] }
wasm-bindgen-futures = { version = "0.4.41", default-features = false }

src/lib.rs

use wasm_bindgen::{prelude::wasm_bindgen, JsCast, JsValue};
use wasm_bindgen_futures::future_to_promise;

#[wasm_bindgen]
extern "C" {
    #[wasm_bindgen(typescript_type = "Promise<string>")]
    pub type PromiseString;
}

#[wasm_bindgen(js_name = bytes)]
pub fn bytes(url: String) -> Result<PromiseString, JsValue> {
    let promise: js_sys::Promise = future_to_promise(async move {
        let resp = reqwest::Client::new()
            .get(url)
            .send()
            .await
            .map_err(|err| err.to_string())?;

        Ok(JsValue::from(format!(
            "bytes: {:?}",
            &resp.bytes().await.map_err(|err| err.to_string())?
        )))
    });
    Ok(promise.unchecked_into())
}

#[wasm_bindgen(js_name = works)]
pub fn works(url: String) -> Result<PromiseString, JsValue> {
    let promise: js_sys::Promise = future_to_promise(async move {
        let resp = reqwest::Client::new()
            .get(url)
            .send()
            .await
            .map_err(|err| err.to_string())?;

        let resp_str: serde_json::Value =
            serde_json::from_str(&resp.text().await.map_err(|err| err.to_string())?).unwrap();
        Ok(JsValue::from(format!(
            "works: {}",
            serde_json::to_string(&resp_str,).unwrap()
        )))
    });
    Ok(promise.unchecked_into())
}

#[wasm_bindgen(js_name = fails)]
pub fn fails(url: String) -> Result<PromiseString, JsValue> {
    let promise: js_sys::Promise = future_to_promise(async move {
        let resp = reqwest::Client::new()
            .get(url)
            .send()
            .await
            .map_err(|err| err.to_string())?;

        Ok(JsValue::from(format!(
            "doesn't work with large data: {:?}",
            &resp
                .json::<serde_json::Value>()
                .await
                .map_err(|err| err.to_string())?
        )))
    });
    Ok(promise.unchecked_into())
}

index.js

// wasm-pack build --target nodejs && node index.js
let { works, fails, bytes } = require("./pkg");

works("https://jsonplaceholder.typicode.com/posts/1/comments").then(console.log).catch(console.error)
fails("https://jsonplaceholder.typicode.com/posts/1/comments").then(console.log).catch(console.error)
bytes("https://jsonplaceholder.typicode.com/posts/1/comments").then(console.log).catch(console.error)
seanmonstar commented 4 months ago

I see a lot of NUL bytes in there... Is that the problem? And perhaps the call to .text() is cleaning those out? If you do .bytes(), and then pass that to serde_json::from_slice(), will you see the same problem?

Thoralf-M commented 4 months ago

Hello @seanmonstar, yes! serde_json::from_slice(&resp.bytes().await.map_err(|err| err.to_string())?).map_err(|err| err.to_string())? also results in expected value at line 1 column 1