Struct reqwest::RequestBuilder

source · [−]
pub struct RequestBuilder { /* private fields */ }
Expand description

A builder to construct the properties of a Request.

Implementations

Add a Header to this Request.

use reqwest::header::USER_AGENT;

let client = reqwest::Client::new();
let res = client.get("https://www.rust-lang.org")
    .header(USER_AGENT, "foo")
    .send()?;

Add a set of Headers to the existing ones on this Request.

The headers will be merged in to any already set.

use reqwest::header::{HeaderMap, HeaderValue, USER_AGENT, CONTENT_TYPE};

fn construct_headers() -> HeaderMap {
    let mut headers = HeaderMap::new();
    headers.insert(USER_AGENT, HeaderValue::from_static("reqwest"));
    headers.insert(CONTENT_TYPE, HeaderValue::from_static("image/png"));
    headers
}

let file = fs::File::open("much_beauty.png")?;
let client = reqwest::Client::new();
let res = client.post("http://httpbin.org/post")
    .headers(construct_headers())
    .body(file)
    .send()?;

Enable HTTP basic authentication.

let client = reqwest::Client::new();
let resp = client.delete("http://httpbin.org/delete")
    .basic_auth("admin", Some("good password"))
    .send()?;

Enable HTTP bearer authentication.

let client = reqwest::Client::new();
let resp = client.delete("http://httpbin.org/delete")
    .bearer_auth("token")
    .send()?;

Set the request body.

Examples

Using a string:

let client = reqwest::Client::new();
let res = client.post("http://httpbin.org/post")
    .body("from a &str!")
    .send()?;

Using a File:

let file = fs::File::open("from_a_file.txt")?;
let client = reqwest::Client::new();
let res = client.post("http://httpbin.org/post")
    .body(file)
    .send()?;

Using arbitrary bytes:

// from bytes!
let bytes: Vec<u8> = vec![1, 10, 100];
let client = reqwest::Client::new();
let res = client.post("http://httpbin.org/post")
    .body(bytes)
    .send()?;

Modify the query string of the URL.

Modifies the URL of this request, adding the parameters provided. This method appends and does not overwrite. This means that it can be called multiple times and that existing query parameters are not overwritten if the same key is used. The key will simply show up twice in the query string. Calling .query(&[("foo", "a"), ("foo", "b")]) gives "foo=a&foo=b".

let client = reqwest::Client::new();
let res = client.get("http://httpbin.org")
    .query(&[("lang", "rust")])
    .send()?;
Note

This method does not support serializing a single key-value pair. Instead of using .query(("key", "val")), use a sequence, such as .query(&[("key", "val")]). It’s also possible to serialize structs and maps into a key-value pair.

Errors

This method will fail if the object you provide cannot be serialized into a query string.

Send a form body.

Sets the body to the url encoded serialization of the passed value, and also sets the Content-Type: application/x-www-form-urlencoded header.

let mut params = HashMap::new();
params.insert("lang", "rust");

let client = reqwest::Client::new();
let res = client.post("http://httpbin.org")
    .form(&params)
    .send()?;
Errors

This method fails if the passed value cannot be serialized into url encoded format

Send a JSON body.

Sets the body to the JSON serialization of the passed value, and also sets the Content-Type: application/json header.

let mut map = HashMap::new();
map.insert("lang", "rust");

let client = reqwest::Client::new();
let res = client.post("http://httpbin.org")
    .json(&map)
    .send()?;
Errors

Serialization can fail if T’s implementation of Serialize decides to fail, or if T contains a map with non-string keys.

Sends a multipart/form-data body.


let client = reqwest::Client::new();
let form = reqwest::multipart::Form::new()
    .text("key3", "value3")
    .file("file", "/path/to/field")?;

let response = client.post("your url")
    .multipart(form)
    .send()?;

See multipart for more examples.

Build a Request, which can be inspected, modified and executed with Client::execute().

Constructs the Request and sends it the target URL, returning a Response.

Errors

This method fails if there was an error while sending request, redirect loop was detected or redirect limit was exhausted.

Attempts to clone the RequestBuilder.

None is returned if a body is which can not be cloned. This can be because the body is a stream.

Examples

With a static body

let client = reqwest::Client::new();
let builder = client.post("http://httpbin.org/post")
    .body("from a &str!");
let clone = builder.try_clone();
assert!(clone.is_some());

Without a body

let client = reqwest::Client::new();
let builder = client.get("http://httpbin.org/get");
let clone = builder.try_clone();
assert!(clone.is_some());

With a non-clonable body

let client = reqwest::Client::new();
let builder = client.get("http://httpbin.org/get")
    .body(reqwest::Body::new(std::io::empty()));
let clone = builder.try_clone();
assert!(clone.is_none());

Trait Implementations

Formats the value using the given formatter. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

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

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.