Could someone explain onSuccess like I was five?

export const deleteApiContent = async (url: string): Promise<HttpStatusResponse | void> => {
    const addr = process.env.REACT_APP_API_URL + url;
    let error_msg = "";
    let status = 0;
    try {
        const response = await axios.delete(addr, { headers: authHeader() });
        return new Promise<HttpStatusResponse>((resolve, reject) => {
            const retval: HttpStatusResponse = {
                response: response.data,
                status: response.status
            }
            if (response.status === 200) {
                resolve(retval);
            } else {
                reject(retval);
            }
        })
    } catch (err: any) {
        if (err.response) {
            error_msg = JSON.stringify(err.response, null, 2);
            status = err.response.status;
            console.log("server error: " + error_msg);
        } else if (err.request) {
            error_msg = JSON.stringify(err.request, null, 2);
            status = err.request.status;
            console.log("no response: " + error_msg);
        } else {
            error_msg = JSON.stringify(err, null, 2);
            console.log("other error: " + error_msg);
        }
    }
    return new Promise<HttpStatusResponse>((resolve, reject) => {
        const retval: HttpStatusResponse = {
            response: error_msg,
            status: status
        }
        reject(retval);
    })
}

export const deleteApiContent = async (url: string): Promise<HttpStatusResponse | void> => {
    const addr = process.env.REACT_APP_API_URL + url;
    let error_msg = "";
    let status = 0;
    try {
        const response = await axios.delete(addr, { headers: authHeader() });
        return new Promise<HttpStatusResponse>((resolve, reject) => {
            const retval: HttpStatusResponse = {
                response: response.data,
                status: response.status
            }
            if (response.status === 200) {
                resolve(retval);
            } else {
                reject(retval);
            }
        })
    } catch (err: any) {
        if (err.response) {
            error_msg = JSON.stringify(err.response, null, 2);
            status = err.response.status;
            console.log("server error: " + error_msg);
        } else if (err.request) {
            error_msg = JSON.stringify(err.request, null, 2);
            status = err.request.status;
            console.log("no response: " + error_msg);
        } else {
            error_msg = JSON.stringify(err, null, 2);
            console.log("other error: " + error_msg);
        }
    }
    return new Promise<HttpStatusResponse>((resolve, reject) => {
        const retval: HttpStatusResponse = {
            response: error_msg,
            status: status
        }
        reject(retval);
    })
}