I'm almost done with server.c but can't seem to find the last error which doesn't allow me to pass check50. I tried to analyse the existing responses to similar questions but couldn't use them to find my bug. Any help would be very much appreciated! The errors I receive are: <!-- language: lang-none --> :( Requesting cat.jpg returns 200, image/jpeg, and correct image :( Requesting /test/ outputs /test/index.html :( Requesting directory containing index.php outputs index.php :( Requesting two files in a row (cat.html then cat.jpg) succeeds Given these errors I suppose there is some existing problem with jpg's and php's. The second one is strange though because I checked with GDB that the indexes function returns the correct path as a result when asked for index.html. ***load()*** <!-- language: lang-c --> bool load(FILE* file, BYTE** content, size_t* length) { *content = NULL; *length = 0; *content = malloc(512 * sizeof(BYTE)); if (*content == NULL) { return false; } size_t size = fread(*content, sizeof(BYTE), 512, file); while (size > 0) { *length += size; *content = realloc(*content, *length * sizeof(BYTE)); if (*content == NULL) { return false; } size = fread(*content + *length, sizeof(BYTE), 512, file); } return true; } EDIT #1 My jpg convertion in the lookup function: <!-- language: lang-c --> else if (strcasecmp(final, ".jpg") == 0) { mime = "image/jpeg"; } The error in Check50 is: <!-- language: lang-none --> expected an exit code of 0, not standard error of "======= Backtrace: =========\n======= M..." except for index.php where the error is: <!-- language: lang-none --> expected output, not standard error of "======= Backtrace: =========\n======= M..." My indexes function seems to be ok, here it is: <!-- language: lang-c --> char* indexes(const char* path) { // ensure path is readable and executable if (access(path, R_OK | X_OK) == -1) { error(403); return NULL; } char* path1 = malloc(60); if (path1 == NULL) { return NULL; } strcpy(path1, path); char* path2 = malloc(50); if (path2 == NULL) { return NULL; } strcpy(path2, path); strcat(path1, "index.php"); strcat(path2, "index.html"); // check if index.html or index.php exists and returns else returns NULL if (access(path1, R_OK) != -1) { return path1; } else if (access(path2, R_OK) != -1) { return path2; } else { return NULL; } }