[Blog](https://scrapfly.io/blog) / [http](https://scrapfly.io/blog/tag/http) / [What is HTTP 413 Error? (Payload Too Large)](https://scrapfly.io/blog/posts/http-error-413-payload-too-large) # What is HTTP 413 Error? (Payload Too Large) by [Mostafa](https://scrapfly.io/blog/author/mostafa) Apr 01, 2026 6 min read [\#http](https://scrapfly.io/blog/tag/http) [ ](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fscrapfly.io%2Fblog%2Fposts%2Fhttp-error-413-payload-too-large "Share on LinkedIn") When web scraping or sending automated requests, encountering HTTP error 413 can be frustrating. This error occurs when the payload you’re sending exceeds the server’s limit. In this article, we'll break down, replicate and test the 413 error. We'll take a look at why it happens, and provide tips on how to manage your payloads efficiently. We'll also explore how Scrapfly can help you bypass these issues and ensure successful requests. ## Key Takeaways Fix 413 request entity too large errors by implementing payload size optimization, request compression, and data chunking strategies to handle large data transfers in web scraping workflows. - Configure payload size limits and implement data compression to avoid 413 errors in POST/PUT requests - Implement data chunking and streaming techniques for large file uploads and data transfers - Configure request headers and content-length management for optimal payload handling - Use specialized tools like ScrapFly for automated payload optimization with anti-blocking features - Implement error handling and retry logic for 413 error scenarios with payload reduction strategies - Monitor payload sizes and implement proactive size validation to prevent 413 errors **Get web scraping tips in your inbox**Trusted by 100K+ developers and 30K+ enterprises. Unsubscribe anytime. ## What is HTTP Error 413? HTTP error "413 request entity too large occurs" when the server refuses to process a request because the size of the payload (the data being sent) exceeds the server's allowed limits. This often happens when you try to upload large files or send a request with a body that’s too large for the server to handle. ## What are HTTP 413 Error Causes? The most common cause of the 413 error is attempting to send a request with a payload that's too big. This usually happens during POST or PUT requests when you send a large file or data set to a server that has a limit on the size of requests it can accept. Since there isn’t always an endpoint or way to know the size limit in advance, you might hit this error unexpectedly. To avoid this, make sure to check the size of the payload you're sending and compress or break it into smaller parts if needed. ### Practical Example To demonstrate how a server would return an HTTP 413 status code (Payload Too Large), let's build a simple [Flask](https://pypi.org/project/Flask/) API with an `/upload` endpoint that accepts file uploads. We'll set a maximum file size limit to simulate a scenario where the client sends a file that exceeds this limit, triggering a `413 Payload Too Large` error. python```python from flask import Flask, jsonify, request app = Flask(__name__) # Set a maximum file size limit (1 MB in this case) MAX_FILE_SIZE = 1024 * 1024 # 1 Megabyte @app.route('/upload', methods=['POST']) def upload_file(): # Check the size of the incoming request content_length = request.content_length if content_length is None: return jsonify({"error": "Content-Length header is missing"}), 411 # 411 Length Required if content_length > MAX_FILE_SIZE: return jsonify({ "error": "Payload Too Large", "message": f"The uploaded file exceeds the maximum allowed size of {MAX_FILE_SIZE / (1024 * 1024)} MB." }), 413 # Proceed if file is within size limit if 'file' not in request.files: return jsonify({"error": "No file part in the request"}), 400 file = request.files['file'] if file: # Assuming file handling logic goes here, e.g., saving the file return jsonify({"message": "File uploaded successfully!"}), 200 if __name__ == '__main__': app.run(debug=True) ``` In this example, the `MAX_FILE_SIZE` is set to 1 MB. The `/upload` endpoint checks the `Content-Length` header of the incoming request to determine the size of the payload. If the size exceeds the allowed limit, the server responds with a `413 Payload Too Large` status code and a message indicating the maximum allowed file size. If the file size is within the allowed limit, the file is processed successfully, and a `200 OK` status is returned. This demonstrates how to handle large payloads and provide appropriate feedback to clients when the file size exceeds the server's limitations. Let's try this with [httpx](https://pypi.org/project/httpx/) client in Python: python```python import httpx import random import string # Function to generate a random string of specified size (in bytes) def generate_random_string(size_in_bytes): # Each character is 1 byte, so size_in_bytes equals the number of characters return ''.join(random.choices(string.ascii_letters + string.digits, k=size_in_bytes)) # Test successful upload (less than 1MB) def test_successful_upload(): small_file_content = generate_random_string(500 * 1024) # 500 KB file files = {'file': ('small_file.txt', small_file_content)} response = httpx.post("http://127.0.0.1:5000/upload", files=files) print(f"Successful Upload: {response.status_code}, {response.json()}") # Test failed upload (more than 1MB) def test_failed_upload(): large_file_content = generate_random_string(2 * 1024 * 1024) # 2 MB file files = {'file': ('large_file.txt', large_file_content)} response = httpx.post("http://127.0.0.1:5000/upload", files=files) print(f"Failed Upload: {response.status_code}, {response.json()}") if __name__ == "__main__": test_successful_upload() test_failed_upload() ``` Here, we replicated both server and client conditions of status code 413 in Python, Flask server and httpx client. ## 413 in Web Scraping 413 in web scraping is usually encountered when sending POST or PUT data payloads that are too large to handle. Often this happens when scraping product paging and requesting too many pages or scraping graphql APIs with large queries. There's also a small posibility that 413 error is returned delibirately by the server to block web scraping and deceive the scraper in thinking there's a technical issue. Indication of this would be 413 errors returned consistently for small payloads or `GET` type requests that don't even have a payload. If that's the case see our guide on [fortifying web scrapers against blocking](https://scrapfly.io/blog/posts/how-to-bypass-anti-bot-protection-when-web-scraping). ## FAQ Can a 413 error be a sign of anti-bot protection rather than a genuine payload limit?Yes, some websites return 413 errors deliberately as part of their [anti-scraping protection](https://scrapfly.io/docs/scrape-api/anti-scraping-protection) strategy, even for small payloads or GET requests. If you consistently receive 413 errors that don't match the actual payload size, the site may be blocking your scraper. See our guide on [avoiding web scraping blocks](https://scrapfly.io/blog/posts/how-to-scrape-without-getting-blocked-tutorial) for techniques to handle this. ## Power Up with Scrapfly ScrapFly provides [web scraping](https://scrapfly.io/docs/scrape-api/getting-started), [screenshot](https://scrapfly.io/docs/screenshot-api/getting-started), and [extraction](https://scrapfly.io/docs/extraction-api/getting-started) APIs for data collection at scale. - [Anti-bot protection bypass](https://scrapfly.io/docs/scrape-api/anti-scraping-protection) - scrape web pages without blocking! - [Rotating residential proxies](https://scrapfly.io/docs/scrape-api/proxy) - prevent IP address and geographic blocks. - [JavaScript rendering](https://scrapfly.io/docs/scrape-api/javascript-rendering) - scrape dynamic web pages through cloud browsers. - [Full browser automation](https://scrapfly.io/docs/scrape-api/javascript-scenario) - control browsers to scroll, input and click on objects. - [Format conversion](https://scrapfly.io/docs/scrape-api/getting-started#api_param_format) - scrape as HTML, JSON, Text, or Markdown. - [Full screenshot customization](https://scrapfly.io/docs/screenshot-api/getting-started#api_param_capture) - scroll and capture exact areas. - [Comprehensive options](https://scrapfly.io/docs/screenshot-api/getting-started) - block banners, use dark mode, and more. - [LLM prompts](https://scrapfly.io/docs/extraction-api/llm-prompt) - extract data or ask questions using LLMs - [Extraction models](https://scrapfly.io/docs/extraction-api/automatic-ai) - automatically find objects like products, articles, jobs, and more. - [Extraction templates](https://scrapfly.io/docs/extraction-api/rules-and-template) - extract data using your own specification. - [Python](https://scrapfly.io/docs/sdk/python) and [Typescript](https://scrapfly.io/docs/sdk/typescript) SDKs, as well as [Scrapy](https://scrapfly.io/docs/sdk/scrapy) and [no-code tool integrations](https://scrapfly.io/docs/integration/getting-started). ## Summary HTTP 413 errors are usually caused by sending a request with a payload that’s too large, but error codes aren’t always accurate and could indicate blocking. By carefully managing your payload size and using tools like Scrapfly to handle retries and proxies, you can overcome these issues and keep your scraping tasks running seamlessly. Table of Contents- [Key Takeaways](#key-takeaways) - [What is HTTP Error 413?](#what-is-http-error-413) - [What are HTTP 413 Error Causes?](#what-are-http-413-error-causes) - [Practical Example](#practical-example) - [413 in Web Scraping](#413-in-web-scraping) - [FAQ](#faq) - [Power Up with Scrapfly](#power-up-with-scrapfly) - [Summary](#summary) Join the Newsletter Get monthly web scraping insights Scale Your Web Scraping Anti-bot bypass, browser rendering, and rotating proxies, all in one API. Start with 1,000 free credits. No credit card required 1,000 free API credits Anti-bot bypass included [Start Free](https://scrapfly.io/register) [View Docs](https://scrapfly.io/docs/onboarding) Not ready? 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