HTTP Status Codes Lookup Tool
Enter an HTTP status code or search by keyword to get detailed information.
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Start Free TrialWhat are HTTP Status Codes?
HTTP status codes are standard response codes given by web servers to indicate the status of the request. They are part of the HTTP specification and help in identifying issues or confirming successful operations when working with web services and APIs.
Why HTTP Status Codes Matter to Developers
Understanding HTTP status codes is crucial for troubleshooting web applications, API integrations, and server configurations. They provide immediate insight into what's happening with your requests and can guide you to resolve issues quickly.
Common HTTP Status Code Categories
- 1xx (Informational): The request was received, and the process is continuing.
- 2xx (Success): The request was successfully received, understood, and accepted.
- 3xx (Redirection): Further action needs to be taken to complete the request.
- 4xx (Client Error): The request contains bad syntax or cannot be fulfilled by the server.
- 5xx (Server Error): The server failed to fulfill a valid request.
HTTP Status Codes in Cloud Hosting
When hosting web applications in cloud environments like Kloudbean, understanding HTTP status codes helps in monitoring application health, configuring proper error handling, setting up redirects, and troubleshooting issues in production.
Frequently Asked Questions
Q. What's the difference between a 301 and 302 redirect?
A 301 status code indicates a permanent redirect, while a 302 indicates a temporary redirect. Search engines treat them differently for SEO purposes.
Q. Why am I getting a 403 Forbidden error?
A 403 error means the server understood your request but refuses to authorize it. This typically relates to permissions issues rather than authentication problems.
Q. What causes a 500 Internal Server Error?
A 500 error is a generic server-side error, often caused by configuration issues, server bugs, or errors in your application code that the server couldn't handle properly.
Q. How can I fix a 404 Not Found error?
A 404 error occurs when the requested resource doesn't exist. You can fix this by ensuring the URL is correct, creating the missing resource, or setting up proper redirects to valid content.
Q. Are HTTP status codes standardized?
Yes, HTTP status codes are defined by the Internet Engineering Task Force (IETF) through various RFCs (Request for Comments). However, some applications and services may implement custom status codes.
Q. What's the difference between 401 Unauthorized and 403 Forbidden?
A 401 error means you need to authenticate (login) first, while a 403 means the server recognizes who you are but you don't have sufficient permissions.
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Not Found
\nThe requested resource was not found on this server.
\n \n", "cloudImplications": "Important for proper error handling in cloud applications; customize for better user experience.", "commonHeaders": { "Content-Type": "Type of error content (HTML, JSON, etc.)" }, "clientReaction": "The client should check the URL and navigation path.", "bestPractices": "Customize 404 pages to help users find what they're looking for instead of leaving the site.", "seoImpact": "Too many 404s can negatively impact SEO; implement proper redirects for moved content." }, "405": { "title": "Method Not Allowed", "category": "4xx", "description": "The request method is known by the server but is not supported by the target resource.", "specification": "RFC 7231", "usage": "Used when an HTTP method (GET, POST, etc.) is not allowed for the requested resource.", "examples": [ "Trying to POST to a read-only resource", "Using DELETE on a protected resource", "Using PUT when only POST is allowed" ], "codeExample": "HTTP/1.1 405 Method Not Allowed\nAllow: GET, HEAD\nContent-Type: application/json\n\n{\"error\": \"Method not allowed\", \"allowed\": [\"GET\", \"HEAD\"]}", "cloudImplications": "Important for RESTful API design in cloud services.", "commonHeaders": { "Allow": "List of allowed HTTP methods", "Content-Type": "Usually application/json for API errors" }, "clientReaction": "The client should use one of the allowed methods instead.", "apiDesign": "Always include the Allow header to inform clients which methods are permitted." }, "406": { "title": "Not Acceptable", "category": "4xx", "description": "The server cannot produce a response matching the list of acceptable values.", "specification": "RFC 7231", "usage": "Used when content negotiation fails, e.g., when the client's Accept headers can't be satisfied.", "examples": [ "Requesting JSON when only XML is available", "Asking for a language version that doesn't exist", "Media type negotiation failures" ], "codeExample": "HTTP/1.1 406 Not Acceptable\nContent-Type: application/json\n\n{\"error\": \"Not acceptable\", \"available\": [\"text/html\", \"application/xml\"], \"requested\": \"application/json\"}", "cloudImplications": "Important for APIs and content delivery services that support multiple formats.", "commonHeaders": { "Content-Type": "Format used for the error message" }, "clientReaction": "The client should modify its Accept headers to allow one of the available formats." }, "407": { "title": "Proxy Authentication Required", "category": "4xx", "description": "Similar to 401 but authentication is needed at the proxy level.", "specification": "RFC 7235", "usage": "Used when a proxy server requires authentication before forwarding the request.", "examples": [ "Corporate proxy authentication", "Network gateway authentication", "Access control at proxy level" ], "codeExample": "HTTP/1.1 407 Proxy Authentication Required\nProxy-Authenticate: Basic realm=\"Proxy\"\nContent-Type: text/html", "cloudImplications": "Relevant for enterprise cloud deployments with proxy-based security.", "commonHeaders": { "Proxy-Authenticate": "Authentication scheme required by the proxy" }, "clientReaction": "The client must authenticate with the proxy before the request can proceed." }, "408": { "title": "Request Timeout", "category": "4xx", "description": "The server timed out waiting for the request.", "specification": "RFC 7231", "usage": "Used when a client takes too long to complete sending its request.", "examples": [ "Slow network connections", "Client starting a request but not completing it", "Excessive processing time on the client side" ], "codeExample": "HTTP/1.1 408 Request Timeout\nConnection: close", "cloudImplications": "Important for managing resources in cloud environments; prevents hung connections.", "commonHeaders": { "Connection": "Usually 'close'" }, "clientReaction": "The client should retry the request, preferably faster or with a more reliable connection.", "serverConfig": "Timeout values are configurable in most cloud servers and load balancers." }, "409": { "title": "Conflict", "category": "4xx", "description": "The request could not be processed because of conflict in the current state of the resource.", "specification": "RFC 7231", "usage": "Used when a request conflicts with the current state of the server, e.g., version conflicts.", "examples": [ "Trying to update a resource that has been modified by another user", "Attempting to create a resource that already exists", "Version control conflicts" ], "codeExample": "HTTP/1.1 409 Conflict\nContent-Type: application/json\n\n{\"error\": \"Conflict\", \"message\": \"Resource has been modified by another request\", \"currentVersion\": \"2\", \"yourVersion\": \"1\"}", "cloudImplications": "Critical for maintaining data integrity in distributed cloud systems.", "clientReaction": "The client should resolve the conflict and resubmit, possibly by retrieving the current state first.", "dataIntegrity": "Often includes version information to help clients resolve the conflict." }, "410": { "title": "Gone", "category": "4xx", "description": "The requested resource is no longer available and will not be available again.", "specification": "RFC 7231", "usage": "Used for resources that have been permanently removed.", "examples": [ "Accessing a deleted blog post", "Expired temporary content", "Resources from discontinued services" ], "codeExample": "HTTP/1.1 410 Gone\nContent-Type: application/json\n\n{\"error\": \"Resource permanently removed\", \"details\": \"This content has been permanently deleted.\"}", "cloudImplications": "Better than 404 for explicitly removed resources; helps with SEO in cloud-hosted sites.", "clientReaction": "The client should remove references to the resource, as it will not be available again.", "seoImpact": "Search engines handle 410 differently than 404, more quickly removing the resource from indexes." }, "411": { "title": "Length Required", "category": "4xx", "description": "The server refuses to accept the request without a defined Content-Length.", "specification": "RFC 7231", "usage": "Used when the Content-Length header is missing but required for the request.", "examples": [ "File uploads without content length", "Streaming content without proper headers", "Malformed POST requests" ], "codeExample": "HTTP/1.1 411 Length Required\nContent-Type: application/json\n\n{\"error\": \"Content-Length header is required for this request\"}", "cloudImplications": "Important for security and resource management in cloud services.", "clientReaction": "The client must include a valid Content-Length header in the request." }, "412": { "title": "Precondition Failed", "category": "4xx", "description": "The server does not meet one of the preconditions specified in the request headers.", "specification": "RFC 7232", "usage": "Used with conditional requests when the condition (like If-Match) is not met.", "examples": [ "ETags not matching in conditional updates", "Modified dates in If-Unmodified-Since not being satisfied", "Optimistic concurrency control" ], "codeExample": "HTTP/1.1 412 Precondition Failed\nETag: \"33a64df551425fcc55e4d42a148795d9f25f89d4\"\nContent-Type: application/json\n\n{\"error\": \"Precondition failed\", \"message\": \"Resource has been modified\"}", "cloudImplications": "Critical for maintaining data consistency in distributed cloud systems.", "commonHeaders": { "ETag": "Current entity tag of the resource" }, "clientReaction": "The client should get the current state of the resource before attempting to modify it again." }, "413": { "title": "Payload Too Large", "category": "4xx", "description": "The request entity is larger than limits defined by server.", "specification": "RFC 7231", "usage": "Used when a client attempts to upload a file that exceeds the server's size limit.", "examples": [ "Uploading files exceeding size limits", "Submitting extremely large forms", "API requests with too much data" ], "codeExample": "HTTP/1.1 413 Payload Too Large\nContent-Type: application/json\n\n{\"error\": \"Payload too large\", \"maxSize\": \"10MB\", \"yourSize\": \"25MB\"}", "cloudImplications": "Important for protecting cloud resources from excessive data and potential DoS attacks.", "commonHeaders": { "Retry-After": "Optional, when the server might accept the payload later" }, "clientReaction": "The client should reduce the size of the request payload.", "serverConfig": "Size limits are typically configurable in cloud server environments." }, "414": { "title": "URI Too Long", "category": "4xx", "description": "The URI requested by the client is longer than the server is willing to interpret.", "specification": "RFC 7231", "usage": "Used when a URL is too long, often due to excessive query parameters.", "examples": [ "URLs with too many query parameters", "Deep nested paths beyond server limits", "Excessively lengthy encoded data in URLs" ], "codeExample": "HTTP/1.1 414 URI Too Long\nContent-Type: application/json\n\n{\"error\": \"URI too long\", \"maxLength\": 2048, \"yourLength\": 2500}", "cloudImplications": "Protective measure in cloud environments; consider using POST with body instead of long query strings.", "clientReaction": "The client should shorten the URI, possibly by using fewer parameters or switching to POST with a request body.", "bestPractices": "For complex queries, use POST requests with the parameters in the request body." }, "415": { "title": "Unsupported Media Type", "category": "4xx", "description": "The media format of the requested data is not supported by the server.", "specification": "RFC 7231", "usage": "Used when the content type of the request body isn't supported, e.g., sending JSON to an XML-only API.", "examples": [ "Sending XML to a JSON-only API", "Uploading images in unsupported formats", "Content type header mismatches" ], "codeExample": "HTTP/1.1 415 Unsupported Media Type\nContent-Type: application/json\n\n{\"error\": \"Unsupported media type\", \"supported\": [\"application/json\"], \"received\": \"application/xml\"}", "cloudImplications": "Common in cloud APIs with specific format requirements.", "clientReaction": "The client should reformat the data using one of the supported content types.", "apiDesign": "API documentation should clearly specify supported content types." }, "416": { "title": "Range Not Satisfiable", "category": "4xx", "description": "The range specified in the Range header cannot be fulfilled.", "specification": "RFC 7233", "usage": "Used when the requested range in a Range header can't be satisfied, e.g., beyond file boundaries.", "examples": [ "Requesting bytes beyond the end of a file", "Invalid range formats", "Range not supported for the specific resource" ], "codeExample": "HTTP/1.1 416 Range Not Satisfiable\nContent-Range: bytes */12345\nContent-Type: application/json", "cloudImplications": "Important for cloud storage and streaming services supporting partial content requests.", "commonHeaders": { "Content-Range": "Indicates the entire size with */size format" }, "clientReaction": "The client should adjust the range request to be within valid boundaries." }, "417": { "title": "Expectation Failed", "category": "4xx", "description": "The expectation given in the Expect request header could not be met.", "specification": "RFC 7231", "usage": "Used when the Expect header requirements can't be met by the server.", "examples": [ "Server unable to handle 100-continue expectation", "Custom expectations not supported by the server" ], "codeExample": "HTTP/1.1 417 Expectation Failed\nContent-Type: application/json\n\n{\"error\": \"Server cannot meet the expectation specified in the Expect header\"}", "cloudImplications": "May occur in complex cloud deployments with varying server capabilities across nodes." }, // More 4xx client errors "429": { "title": "Too Many Requests", "category": "4xx", "description": "The user has sent too many requests in a given amount of time.", "specification": "RFC 6585", "usage": "Used for rate limiting to prevent abuse or overloading of services.", "examples": [ "API rate limits being exceeded", "Brute force login protection", "DDoS protection measures" ], "codeExample": "HTTP/1.1 429 Too Many Requests\nRetry-After: 60\nContent-Type: application/json\n\n{\"error\": \"Rate limit exceeded\", \"retryAfter\": \"60 seconds\", \"limit\": \"100 requests per minute\"}", "cloudImplications": "Essential for protecting cloud services from abuse and ensuring fair resource allocation.", "commonHeaders": { "Retry-After": "Seconds to wait before making another request" } }, // 5xx Server Errors "500": { "title": "Internal Server Error", "category": "5xx", "description": "The server has encountered a situation it doesn't know how to handle.", "specification": "RFC 7231", "usage": "A generic error message when an unexpected condition was encountered on the server.", "examples": [ "Programming errors", "Database connection failures", "Unexpected exceptions in server-side code" ], "codeExample": "HTTP/1.1 500 Internal Server Error\nContent-Type: application/json\n\n{\"error\": \"Internal server error\", \"requestId\": \"xyz-123\"}", "cloudImplications": "Critical to monitor in cloud environments; often indicates application bugs or resource issues.", "bestPractices": "Include logging identifiers to correlate user-facing errors with internal logs." }, "502": { "title": "Bad Gateway", "category": "5xx", "description": "The server, while acting as a gateway or proxy, received an invalid response from the upstream server.", "specification": "RFC 7231", "usage": "Used when a gateway or proxy server gets an invalid response from an upstream server.", "examples": [ "Reverse proxy unable to connect to backend", "Microservices communication failures", "Invalid responses from third-party APIs" ], "codeExample": "HTTP/1.1 502 Bad Gateway\nContent-Type: application/json\n\n{\"error\": \"Bad gateway\", \"details\": \"Upstream server returned an invalid response\"}", "cloudImplications": "Common in microservices architectures and multi-tier cloud applications." }, "503": { "title": "Service Unavailable", "category": "5xx", "description": "The server is not ready to handle the request, often due to maintenance or overloading.", "specification": "RFC 7231", "usage": "Used for temporary server outages, maintenance windows, or overload situations.", "examples": [ "Server maintenance periods", "Traffic overloads", "Resource exhaustion" ], "codeExample": "HTTP/1.1 503 Service Unavailable\nRetry-After: 3600\nContent-Type: application/json\n\n{\"error\": \"Service unavailable\", \"maintenance\": \"Scheduled maintenance until 14:00 UTC\"}", "cloudImplications": "Important for graceful handling of scaling events and planned maintenance in cloud services.", "commonHeaders": { "Retry-After": "Estimate of when service will be available" } } }; // Get DOM elements const statusInput = document.getElementById('status-input'); const lookupButton = document.getElementById('lookup-button'); const clearButton = document.getElementById('clear-button'); const singleResult = document.getElementById('single-result'); const multipleResults = document.getElementById('multiple-results'); const statusMessage = document.getElementById('status-message'); const suggestionsList = document.getElementById('suggestions'); const quickOptions = document.querySelectorAll('.quick-option'); // Function to look up HTTP status code function lookupStatusCode() { const query = statusInput.value.trim(); // Hide suggestions suggestionsList.style.display = 'none'; // Clear previous results singleResult.innerHTML = ''; multipleResults.innerHTML = ''; // Hide status message statusMessage.style.display = 'none'; if (!query) { showStatus('Please enter a status code or keyword to search.', 'invalid'); return; } // Check if input is a valid status code if (/^\d{3}$/.test(query) && httpStatusCodes[query]) { // Display single status code displaySingleStatusCode(query); } else { // Search by keyword const results = searchStatusCodesByKeyword(query); if (results.length > 0) { displayMultipleStatusCodes(results); } else { showStatus('No HTTP status codes found matching your query. Try a different search term.', 'invalid'); } } } // Function to display a single status code with enhanced details function displaySingleStatusCode(code) { const statusCode = httpStatusCodes[code]; const categoryClass = `status-${statusCode.category.substring(0,1)}xx`; let examplesHTML = ''; if (statusCode.examples && statusCode.examples.length > 0) { examplesHTML = `-
${statusCode.examples.map(example => `
- ${example} `).join('')}
${code} ${statusCode.title}
${statusCode.description}
${examplesHTML}- Category:
- ${getCategoryName(statusCode.category)}
- Specification:
- ${statusCode.specification}
- Common Usage:
- ${statusCode.usage} ${statusCode.cloudImplications ? `
- Cloud Implications:
- ${statusCode.cloudImplications} ` : ''} ${statusCode.clientReaction ? `
- Client Reaction:
- ${statusCode.clientReaction} ` : ''}
${getCategoryName(category)}
`; for (const code of groupedResults[category]) { const statusCode = httpStatusCodes[code]; const categoryClass = `status-${statusCode.category.substring(0,1)}xx`; resultsHTML += `${code} ${statusCode.title}
${statusCode.description}
Usage: ${statusCode.usage}