Method fetch

java/lib/src/main/java/io/github/ccxt/Exchange.java:2037–2144

(Object url2, Object method2, Object headers2, Object body2)

    }

    public CompletableFuture<Object> fetch(Object url2, Object method2, Object headers2, Object body2) {
        if (this.fetchResponse != null) {
            return CompletableFuture.completedFuture(this.fetchResponse);
        }
        ensureHttpClientUpToDate();

        String url = (String) url2;
        String method = (String) method2;
        @SuppressWarnings("unchecked")
        Map<String, Object> headersArg = (headers2 instanceof Map) ? (Map<String, Object>) headers2 : null;
        @SuppressWarnings("unchecked")
        Map<String, Object> headers = (Map<String, Object>) this.extend(this.headers, headersArg);
        String body = (String) body2;

        Object proxyUrlObj = this.checkProxyUrlSettings(url, method, headers, body);
        if (proxyUrlObj != null) {
            String proxyUrl = proxyUrlObj.toString();
            url = proxyUrl + this.urlEncoderForProxyUrl(url).toString();
        }

        if (this.verbose) {
            this.log(
                    "fetch Request:\n"
                    + this.id + " " + method + " " + url
                    + "\nRequestHeaders:\n" + this.json(headers)
                    + "\nRequestBody:\n" + this.json(body) + "\n"
            );
        }

         this.checkProxySettings(url, method, headers, body);

        List<String> headerKeys = new java.util.ArrayList<>(headers.keySet());
        String contentType = "";

        HttpRequest.Builder requestBuilder = HttpRequest.newBuilder();
        // Java's URI.create is strict (RFC 3986) and rejects characters like
        // ", |, {, }, ^, `, <, > in the query, even though Node fetch / axios
        // accept them. Some exchanges (e.g. coinsph parseArrayParam) emit
        // partially-encoded queries — `?symbols=%5B"BTCUSDT"%5D` — that round-
        // trip through TS but throw URISyntaxException here. Percent-encode
        // any remaining illegal chars before parsing.
        requestBuilder.uri(URI.create(escapeIllegalUriChars(url)));

        // Apply HTTP timeout
        if (this.timeout != null) {
            long timeoutMs;
            if (this.timeout instanceof Number) {
                timeoutMs = ((Number) this.timeout).longValue();
            } else {
                timeoutMs = Long.parseLong(this.timeout.toString());
            }
            if (timeoutMs > 0) {
                requestBuilder.timeout(java.time.Duration.ofMillis(timeoutMs));
            }
        }

        if (this.userAgent != null && this.userAgent.length() > 0) {
            requestBuilder.header("User-Agent", this.userAgent);