Zig

REST with Query Params

See more REST Examples

Demonstrates how to add query params for a REST request. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Let's say we want to send a GET request to
    // https://example.com/search?query=hello%20world&category=books&sortBy=price&filterBy=inStock

    // Notice that the query parameter values must be URL encoded.

    // Let's also explain the parts of the above URL:

    //     Scheme: https
    //         The scheme specifies the protocol used to access the resource.
    //         In this case, it is "https," which indicates that the resource is accessed using the Hypertext Transfer Protocol Secure (HTTPS).
    //
    //     Host: example.com
    //         The host part of the URL identifies the domain name or IP address of the server hosting the resource. In this case, "example.com" is the host.
    //
    //     Path: /search
    //         The path is the specific location or resource on the server that the client wants to access.
    //         In this URL, the path is "/search," indicating that the client is requesting the "search" resource on the server.
    //
    //     Query Parameters:
    //         Query parameters are used to send additional data to the server as key-value pairs.
    //         They are separated from the path by a question mark ? and each parameter is separated by an ampersand &.
    //
    //         The above URL has four query parameters:
    //             query=hello%20world: The "query" parameter with the value "hello world". The %20 represents the URL-encoded space character in the value.
    //             category=books: The "category" parameter with the value "books".
    //             sortBy=price: The "sortBy" parameter with the value "price".
    //             filterBy=inStock: The "filterBy" parameter with the value "inStock".

    const rest = try chilkat.Rest.init();
    defer rest.deinit();

    // Connect to the REST server.

    // The Host part of the URL is passed in the 1st argument.
    // The Scheme part of the URL ("https") is indicated by the 2nd and 3rd arguments (port and bTls).
    const b_tls = true;
    const port = 443;
    const b_auto_reconnect = true;
    try rest.connect("example.com", port, b_tls, b_auto_reconnect);

    // There are 3 ways to send the above GET request.

    // 1) Send the request with path and query params pre-built, where the query param values are URL encoded.
    var response_json: [:0]const u8 = rest.fullRequestNoBody(alloc, "GET", "/search?query=hello%20world&category=books&sortBy=price&filterBy=inStock") catch {
        std.debug.print("{s}\n", .{try rest.getLastErrorText(alloc)});
        return;
    };

    // 2) Pass only the Path part of the URL, and specify the query params separately by calling AddQueryParams beforehand.
    //    Again, the query params must be already URL encoded when passed to AddQueryParams
    rest.clearAllQueryParams() catch {};
    rest.addQueryParams("query=hello%20world&category=books&sortBy=price&filterBy=inStock") catch {};
    response_json = try rest.fullRequestNoBody(alloc, "GET", "/search");
    // ...
    // ...

    // 3) Pass each query parameter separately by calling AddQueryParam.  In this case, the query param value should be passed without URL encoding.
    //    (ClearAllQueryParams ensures any params set for previous request are cleared.)
    rest.clearAllQueryParams() catch {};
    rest.addQueryParam("query", "hello world") catch {};
    rest.addQueryParam("category", "books") catch {};
    rest.addQueryParam("sortBy", "price") catch {};
    rest.addQueryParam("filterBy", "inStock") catch {};
    response_json = try rest.fullRequestNoBody(alloc, "GET", "/search");
    // ...
    // ...
}