Heroku
tcp/443
Exposing Swagger/OpenAPI documentation is primarily a risk if your API has underlying security flaws, as it gives attackers a precise roadmap to find them.
Those detail every endpoint, parameter, and data model, making it easier to discover and exploit vulnerabilities like broken access control or injection points.
While a perfectly secure API mitigates the danger, protecting your documentation is a critical layer of defense that forces attackers to work without a map.
Severity: info
Fingerprint: 5733ddf49ff49cd1926e27d0926e27d0926e27d0926e27d0926e27d0926e27d0
Public Swagger UI/API detected at path: /webjars/swagger-ui/index.html
Open service 52.223.53.203:443 · api.instantpdf.eu
2026-01-09 21:04
HTTP/1.1 200 OK
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Content-Language: en-US
Content-Type: text/html;charset=UTF-8
Date: Fri, 09 Jan 2026 21:04:28 GMT
Expires: 0
Nel: {"report_to":"heroku-nel","response_headers":["Via"],"max_age":3600,"success_fraction":0.01,"failure_fraction":0.1}
Pragma: no-cache
Report-To: {"group":"heroku-nel","endpoints":[{"url":"https://nel.heroku.com/reports?s=wTZumfmM%2FHb8Dr5NkhjwgOQmkaw0bhnM9zI%2BZJduBwI%3D\u0026sid=812dcc77-0bd0-43b1-a5f1-b25750382959\u0026ts=1767992668"}],"max_age":3600}
Reporting-Endpoints: heroku-nel="https://nel.heroku.com/reports?s=wTZumfmM%2FHb8Dr5NkhjwgOQmkaw0bhnM9zI%2BZJduBwI%3D&sid=812dcc77-0bd0-43b1-a5f1-b25750382959&ts=1767992668"
Server: Heroku
Strict-Transport-Security: max-age=31536000 ; includeSubDomains
Via: 1.1 heroku-router
X-Content-Type-Options: nosniff
X-Frame-Options: DENY
X-Xss-Protection: 1; mode=block
Connection: close
Transfer-Encoding: chunked
Page title: Instant PDF, Online PDF Generator, synchronous PDF generator, PDF API, HTML Template PDF, HTML to PDF, PDF signature
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />
<link rel="stylesheet" crossorigin="anonymous" href="/css/bootstrap/bootstrap.min.css" />
<link rel="icon" type="image/x-icon" href="/img/favicon.jpg" />
<script type="text/javascript" src="/js/jquery/jquery.js"></script>
<script type="text/javascript" src="/js/iconify/iconify3.1.0.min.js"></script>
<script type="text/javascript" src="/js/bootstrap/bootstrap.bundle.js"></script>
<script type="text/javascript" src="/js/simplepdf.js"></script>
<link rel="stylesheet" href="/custom.css" />
<!-- Add meta tags for SEO -->
<title>Instant PDF, Online PDF Generator, synchronous PDF generator, PDF API, HTML Template PDF, HTML to PDF, PDF signature</title>
<meta name="robots" content="all" />
<link rel="canonical" href="https://www.instantpdf.eu" />
<meta name="description" content="InstantPDF generates hassle-free, template-based PDF documents with a single synchronous REST API call." />
<!-- Add Open Graph meta tags for social media sharing -->
<meta property="og:title" content="InstantPDF: Synchronous, Template-based PDF Generator" />
<meta property="og:description" content="InstantPDF generates hassle-free, template-based PDF documents with a single synchronous REST API call." />
<meta property="og:image" content="https://www.instantpdf.eu/social.jpg" />
<meta property="og:url" content="https://www.instantpdf.eu" />
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<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png" />
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display: none; /* Hidden by default */
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z-index: 1; /* Sit on top */
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border: 1px solid #888;
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/*hr {
border: 1px solid #f1f1f1;
margin-bottom: 25px;
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.close {
position: absolute;
right: 35px;
top: 15px;
font-size: 40px;
font-weight: bold;
color: #f1f1f1;
}
.close:hover,
.close:focus {
color: #f44336;
cursor: pointer;
}
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.clearfix::after {
Open service 52.223.53.203:443 · api.instantpdf.eu
2026-01-02 23:04
HTTP/1.1 200 OK
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Content-Language: en-US
Content-Type: text/html;charset=UTF-8
Date: Fri, 02 Jan 2026 23:04:25 GMT
Expires: 0
Nel: {"report_to":"heroku-nel","response_headers":["Via"],"max_age":3600,"success_fraction":0.01,"failure_fraction":0.1}
Pragma: no-cache
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Server: Heroku
Strict-Transport-Security: max-age=31536000 ; includeSubDomains
Via: 1.1 heroku-router
X-Content-Type-Options: nosniff
X-Frame-Options: DENY
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Connection: close
Transfer-Encoding: chunked
Page title: Instant PDF, Online PDF Generator, synchronous PDF generator, PDF API, HTML Template PDF, HTML to PDF, PDF signature
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />
<link rel="stylesheet" crossorigin="anonymous" href="/css/bootstrap/bootstrap.min.css" />
<link rel="icon" type="image/x-icon" href="/img/favicon.jpg" />
<script type="text/javascript" src="/js/jquery/jquery.js"></script>
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<script type="text/javascript" src="/js/bootstrap/bootstrap.bundle.js"></script>
<script type="text/javascript" src="/js/simplepdf.js"></script>
<link rel="stylesheet" href="/custom.css" />
<!-- Add meta tags for SEO -->
<title>Instant PDF, Online PDF Generator, synchronous PDF generator, PDF API, HTML Template PDF, HTML to PDF, PDF signature</title>
<meta name="robots" content="all" />
<link rel="canonical" href="https://www.instantpdf.eu" />
<meta name="description" content="InstantPDF generates hassle-free, template-based PDF documents with a single synchronous REST API call." />
<!-- Add Open Graph meta tags for social media sharing -->
<meta property="og:title" content="InstantPDF: Synchronous, Template-based PDF Generator" />
<meta property="og:description" content="InstantPDF generates hassle-free, template-based PDF documents with a single synchronous REST API call." />
<meta property="og:image" content="https://www.instantpdf.eu/social.jpg" />
<meta property="og:url" content="https://www.instantpdf.eu" />
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font-size: 40px;
font-weight: bold;
color: #f1f1f1;
}
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color: #f44336;
cursor: pointer;
}
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Open service 52.223.53.203:443 · api.instantpdf.eu
2025-12-30 10:20
HTTP/1.1 200 OK
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Content-Language: en-US
Content-Type: text/html;charset=UTF-8
Date: Tue, 30 Dec 2025 10:20:37 GMT
Expires: 0
Nel: {"report_to":"heroku-nel","response_headers":["Via"],"max_age":3600,"success_fraction":0.01,"failure_fraction":0.1}
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Server: Heroku
Strict-Transport-Security: max-age=31536000 ; includeSubDomains
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Page title: Instant PDF, Online PDF Generator, synchronous PDF generator, PDF API, HTML Template PDF, HTML to PDF, PDF signature
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />
<link rel="stylesheet" crossorigin="anonymous" href="/css/bootstrap/bootstrap.min.css" />
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<script type="text/javascript" src="/js/bootstrap/bootstrap.bundle.js"></script>
<script type="text/javascript" src="/js/simplepdf.js"></script>
<link rel="stylesheet" href="/custom.css" />
<!-- Add meta tags for SEO -->
<title>Instant PDF, Online PDF Generator, synchronous PDF generator, PDF API, HTML Template PDF, HTML to PDF, PDF signature</title>
<meta name="robots" content="all" />
<link rel="canonical" href="https://www.instantpdf.eu" />
<meta name="description" content="InstantPDF generates hassle-free, template-based PDF documents with a single synchronous REST API call." />
<!-- Add Open Graph meta tags for social media sharing -->
<meta property="og:title" content="InstantPDF: Synchronous, Template-based PDF Generator" />
<meta property="og:description" content="InstantPDF generates hassle-free, template-based PDF documents with a single synchronous REST API call." />
<meta property="og:image" content="https://www.instantpdf.eu/social.jpg" />
<meta property="og:url" content="https://www.instantpdf.eu" />
<!-- Favicon -->
<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png" />
<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png" />
<link rel="manifest" href="/site.webmanifest" />
<style>
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display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
left: 0;
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display: none; /* Hidden by default */
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.clearfix::after {
Open service 52.223.53.203:443 · api.instantpdf.eu
2025-12-23 03:11
HTTP/1.1 200 OK
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Content-Language: en-US
Content-Type: text/html;charset=UTF-8
Date: Tue, 23 Dec 2025 03:11:07 GMT
Expires: 0
Nel: {"report_to":"heroku-nel","response_headers":["Via"],"max_age":3600,"success_fraction":0.01,"failure_fraction":0.1}
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Reporting-Endpoints: heroku-nel="https://nel.heroku.com/reports?s=B7qs1eJ8AhbA4bygnVgnwQT0h3STnXJmVP8sAfmYyME%3D&sid=812dcc77-0bd0-43b1-a5f1-b25750382959&ts=1766459467"
Server: Heroku
Strict-Transport-Security: max-age=31536000 ; includeSubDomains
Via: 1.1 heroku-router
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Page title: Instant PDF, Online PDF Generator, synchronous PDF generator, PDF API, HTML Template PDF, HTML to PDF, PDF signature
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />
<link rel="stylesheet" crossorigin="anonymous" href="/css/bootstrap/bootstrap.min.css" />
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<script type="text/javascript" src="/js/iconify/iconify3.1.0.min.js"></script>
<script type="text/javascript" src="/js/bootstrap/bootstrap.bundle.js"></script>
<script type="text/javascript" src="/js/simplepdf.js"></script>
<link rel="stylesheet" href="/custom.css" />
<!-- Add meta tags for SEO -->
<title>Instant PDF, Online PDF Generator, synchronous PDF generator, PDF API, HTML Template PDF, HTML to PDF, PDF signature</title>
<meta name="robots" content="all" />
<link rel="canonical" href="https://www.instantpdf.eu" />
<meta name="description" content="InstantPDF generates hassle-free, template-based PDF documents with a single synchronous REST API call." />
<!-- Add Open Graph meta tags for social media sharing -->
<meta property="og:title" content="InstantPDF: Synchronous, Template-based PDF Generator" />
<meta property="og:description" content="InstantPDF generates hassle-free, template-based PDF documents with a single synchronous REST API call." />
<meta property="og:image" content="https://www.instantpdf.eu/social.jpg" />
<meta property="og:url" content="https://www.instantpdf.eu" />
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<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png" />
<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png" />
<link rel="manifest" href="/site.webmanifest" />
<style>
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.modal {
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
left: 0;
top: 0;
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font-weight: bold;
color: #f1f1f1;
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cursor: pointer;
}
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Open service 52.223.53.203:443 · api.instantpdf.eu
2025-12-21 07:54
HTTP/1.1 200 OK
Cache-Control: no-cache, no-store, max-age=0, must-revalidate
Content-Language: en-US
Content-Type: text/html;charset=UTF-8
Date: Sun, 21 Dec 2025 07:54:09 GMT
Expires: 0
Nel: {"report_to":"heroku-nel","response_headers":["Via"],"max_age":3600,"success_fraction":0.01,"failure_fraction":0.1}
Pragma: no-cache
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Server: Heroku
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Page title: Instant PDF, Online PDF Generator, synchronous PDF generator, PDF API, HTML Template PDF, HTML to PDF, PDF signature
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />
<link rel="stylesheet" crossorigin="anonymous" href="/css/bootstrap/bootstrap.min.css" />
<link rel="icon" type="image/x-icon" href="/img/favicon.jpg" />
<script type="text/javascript" src="/js/jquery/jquery.js"></script>
<script type="text/javascript" src="/js/iconify/iconify3.1.0.min.js"></script>
<script type="text/javascript" src="/js/bootstrap/bootstrap.bundle.js"></script>
<script type="text/javascript" src="/js/simplepdf.js"></script>
<link rel="stylesheet" href="/custom.css" />
<!-- Add meta tags for SEO -->
<title>Instant PDF, Online PDF Generator, synchronous PDF generator, PDF API, HTML Template PDF, HTML to PDF, PDF signature</title>
<meta name="robots" content="all" />
<link rel="canonical" href="https://www.instantpdf.eu" />
<meta name="description" content="InstantPDF generates hassle-free, template-based PDF documents with a single synchronous REST API call." />
<!-- Add Open Graph meta tags for social media sharing -->
<meta property="og:title" content="InstantPDF: Synchronous, Template-based PDF Generator" />
<meta property="og:description" content="InstantPDF generates hassle-free, template-based PDF documents with a single synchronous REST API call." />
<meta property="og:image" content="https://www.instantpdf.eu/social.jpg" />
<meta property="og:url" content="https://www.instantpdf.eu" />
<!-- Favicon -->
<link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />
<link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png" />
<link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png" />
<link rel="manifest" href="/site.webmanifest" />
<style>
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.modal {
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
left: 0;
top: 0;
/*width: 100%; Full width */
/*height: 100%; /* Full height */
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display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
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left: 50%;
transform: translate(-50%, -50%);
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right: 35px;
top: 15px;
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font-weight: bold;
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color: #f44336;
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Open service 52.223.53.203:443 · api.instantpdf.eu
2025-12-19 09:26
HTTP/1.1 200 OK
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Date: Fri, 19 Dec 2025 09:26:33 GMT
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Transfer-Encoding: chunked
Page title: Instant PDF, Online PDF Generator, synchronous PDF generator, PDF API, HTML Template PDF, HTML to PDF, PDF signature
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
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<meta http-equiv="Expires" content="0" />
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<script type="text/javascript" src="/js/simplepdf.js"></script>
<link rel="stylesheet" href="/custom.css" />
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<title>Instant PDF, Online PDF Generator, synchronous PDF generator, PDF API, HTML Template PDF, HTML to PDF, PDF signature</title>
<meta name="robots" content="all" />
<link rel="canonical" href="https://www.instantpdf.eu" />
<meta name="description" content="InstantPDF generates hassle-free, template-based PDF documents with a single synchronous REST API call." />
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<meta property="og:title" content="InstantPDF: Synchronous, Template-based PDF Generator" />
<meta property="og:description" content="InstantPDF generates hassle-free, template-based PDF documents with a single synchronous REST API call." />
<meta property="og:image" content="https://www.instantpdf.eu/social.jpg" />
<meta property="og:url" content="https://www.instantpdf.eu" />
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<link rel="manifest" href="/site.webmanifest" />
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display: none; /* Hidden by default */
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